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WAC 296-62-09004

Ionizing radiation.

(1) Definitions applicable to this section.
Note:
Definitions also appear in some subsections.
(a) Radiation. Includes alpha rays, beta rays, gamma rays, X-rays, neutrons, high-speed electrons, high-speed protons, and other atomic particles; but such term does not include sound or radio waves, or visible light, or infrared or ultraviolet light.
(b) Radioactive material. Any material which emits, by spontaneous nuclear disintegration, corpuscular or electromagnetic emanations.
(c) Restricted area. Any area access to which is controlled by the employer for purposes of protection of individuals from exposure to radiation or radioactive materials.
(d) Unrestricted area. Any area access to which is not controlled by the employer for purposes of protection of individuals from exposure to radiation or radioactive materials.
(e) Dose. The quantity of ionizing radiation absorbed, per unit of mass, by the body or by any portion of the body. When the provisions in this section specify a dose during a period of time, the dose is the total quantity of radiation absorbed, per unit of mass, by the body or by any portion of the body during such period of time. Several different units of dose are in current use. Definitions of units used in this section are set forth in subdivisions (f) and (g) of this subsection.
(f) Rad. A measure of the dose of any ionizing radiation to body tissues in terms of the energy absorbed per unit of mass of the tissue. One rad is the dose corresponding to the absorption of 100 ergs per gram of tissue (1 millirad (mrad) = 0.001 rad).
(g) Rem. A measure of the dose of any ionizing radiation to body tissue in terms of its estimated biological effect relative to a dose of 1 roentgen (r) of X-rays (1 millirem (mrem) = 0.001 rem). The relation of the rem to other dose units depends upon the biological effect under consideration and upon the conditions for irradiation. Each of the following is considered to be equivalent to a dose of 1 rem:
(i) A dose of 1 roentgen due to x- or gamma radiation;
(ii) A dose of 1 rad due to x-, gamma, or beta radiation;
(iii) A dose of 0.1 rad due to neutrons or high energy protons;
(iv) A dose of 0.05 rad due to particles heavier than protons and with sufficient energy to reach the lens of the eye;
(v) If it is more convenient to measure the neutron flux, or equivalent, than to determine the neutron dose in rads, as provided in item (iii) of this subdivision, 1 rem of neutron radiation may, for purposes of the provisions in this section be assumed to be equivalent to 14 million neutrons per square centimeter incident upon the body; or, if there is sufficient information to estimate with reasonable accuracy the approximate distribution in energy of the neutrons, the incident number of neutrons per square centimeter equivalent to 1 rem may be estimated from the following table:
Neutron Flux Dose Equivalents
Neutron energy
(million electron volts (Mev))
Number of
neutrons per square centimeter
equivalent to a
dose of 1 rem
(neutrons/cm2)
Average flux to
deliver 100
millirem
in 40 hours
(neutrons/cm2
per sec.)
Thermal. . . .
 
970 X 106
670
0.0001. . . .
 
720 X 106
500
0.005. . . .
 
820 X 106
570
0.02. . . .
 
400 X 106
280
0.1. . . .
 
120 X 106
80
0.5. . . .
 
43 X 106
30
1.0. . . .
 
26 X 106
18
2.5. . . .
 
29 X 106
20
5.0. . . .
 
26 X 106
18
7.5. . . .
 
24 X 106
17
10. . . .
 
24 X 106
17
10 to 30. . . .
 
14 X 106
10
(h) For determining exposures to X- or gamma rays up to 3 Mev., the dose limits specified in this section may be assumed to be equivalent to the "air dose." For the purpose of this section "air dose" means that the dose is measured by a properly calibrated appropriate instrument in air at or near the body surface in the region of the highest dosage rate.
(i) Curie. A unit of measurement of radioactivity. One curie (Ci) is that quantity of radioactive material which decays at the rate of 2.2 x 1012 disintegrations per minute (dpm).
(i) One millicurie (mCi) = 10-3Ci
(ii) One microcurie (uCi) = 10-6Ci
(iii) One nanocurie (nCi) = 10-9Ci
(iv) One picocurie (pCi) = 10-12Ci
(2) Nuclear Regulatory Commission licensees—NRC contractors operating NRC plants and facilities.
(a) Any employer who possesses or uses source material, byproduct material, or special nuclear material, as defined in the Atomic Energy Act of 1954, as amended, under a license issued by the Nuclear Regulatory Commission and in accordance with the requirements of chapter 402-24 WAC shall be deemed to be in compliance with the requirements of this section with respect to such possession and use.
(b) NRC contractors operating NRC plants and facilities: Any employer who possesses or uses source material, byproduct material, special nuclear material, or other radiation sources under a contract with the Nuclear Regulatory Commission for the operation of NRC plants and facilities and in accordance with the standards, procedures, and other requirements for radiation protection established by the commission for such contract pursuant to the Atomic Energy Act of 1954 as amended (42 U.S.C. 2011 et seq.) shall be deemed to be in compliance with the requirements of this section with respect to such possession and use.
(c) State licensees or registrants:
(i) Atomic Energy Act sources. Any employer who possesses or uses source material, byproduct material, or special nuclear material, as defined in the Atomic Energy Act of 1954, as amended (42 U.S.C. 2011 et seq.), and has registered such sources with, the state must be deemed to be in compliance with the radiation requirements of this section, insofar as his possession and use of such material is concerned.
(ii) Other sources. Any employer who possesses or uses radiation sources other than source material, byproduct material, or special nuclear material, as defined in the Atomic Energy Act of 1954, as amended (42 U.S.C. 2011 et seq.), and has registered such sources with the state must be deemed to be in compliance with the radiation requirements of this section insofar as his possession and use of such material is concerned.
(3) Exposure of individuals to radiation in restricted areas.
(a) Except as provided in subdivision (b) of this subsection, no employer shall possess, use, or transfer sources of ionizing radiation in such a manner as to cause any individual in a restricted area to receive in any period of one calendar quarter from sources in the employer's possession or control a dose in excess of the limits specified in the following table:
EXPOSURE IN RESTRICTED AREAS
Rems per
Calendar
Quarter
Whole body: Head and trunk; active blood-forming organs; lens of eyes; or gonads. . . .
1 1/4
Hand and forearms; feet and ankles. . . .
18 3/4
Skin of whole body. . . .
7 1/2
(b) An employer may permit an individual in a restricted area to receive doses to the whole body greater than those permitted under subdivision (a) of this subsection, so long as:
(i) During any calendar quarter the dose to the whole body shall not exceed 3 rems; and
(ii) The dose to the whole body, when added to the accumulated occupational dose to the whole body, shall not exceed 5 (N-18) rems, where "N" equals the individual's age in years at his last birthday; and
(iii) The employer maintains adequate past and current exposure records which show that the addition of such a dose will not cause the individual to exceed the amount authorized in this subdivision. As used in this subdivision "Dose to the whole body" must be deemed to include any dose to the whole body, gonad, active blood-forming organs, head and trunk, or lens of the eye.
(c) No employer must permit any employee who is under eighteen years of age to receive in any period of one calendar quarter a dose in excess of ten percent of the limits specified in the preceding table entitled "exposure in restricted areas."
(d) Calendar quarter. Any three-month period determined as follows:
(i) The first period of any year may begin on any date in January: Provided, That the second, third and fourth periods accordingly begin on the same date in April, July, and October, respectively, and that the fourth period extends into January of the succeeding year, if necessary to complete a three-month quarter. During the first year of use of this method of determination, the first period for that year must also include any additional days in January preceding the starting date for the first period; or
(ii) The first period in a calendar year of thirteen complete, consecutive calendar weeks; the second period in a calendar year of thirteen complete consecutive weeks; the third period in a calendar year of thirteen complete, consecutive calendar weeks; the fourth period in a calendar year of thirteen complete, consecutive calendar weeks. If at the end of a calendar year there are any days not falling within a complete calendar week of that year, such days must be included within the last complete calendar week of that year. If at the beginning of any calendar year there are days not falling within a complete calendar week of that year, such days shall be included within the last complete calendar week of the previous year; or
(iii) The four periods in a calendar year may consist of the first 14 complete, consecutive calendar weeks; the next twelve complete, consecutive calendar weeks, the next fourteen complete, consecutive calendar weeks, and the last twelve complete, consecutive calendar weeks. If at the end of a calendar year there are any days not falling within a complete calendar week of that year, such days must be included (for purposes of this section) within the last complete calendar week of the year. If at the beginning of any calendar year there are days not falling within a complete calendar week of that year, such days must be included (for purposes of this section) within the last complete week of the previous year.
(e) No employer must change the method used by him to determine calendar quarters except at the beginning of a calendar year.
(4) Exposure to airborne radioactive material.
(a) No employer must possess, use or transport radioactive material in such a manner as to cause any employee, within a restricted area, to be exposed to airborne radioactive material in an average concentration in excess of the limits specified in Table I of WAC 402-24-220, Appendix A. The limits given in Table I are for exposure to the concentrations specified for forty hours in any workweek of seven consecutive days. In any such period where the number of hours of exposure is less than 40 the limits specified in the table may be increased proportionately. In any such period where the number of hours of exposure is greater than forty, the limits specified in the table shall be decreased proportionately.
(b) No employer shall possess, use, or transfer radioactive material in such a manner as to cause any individual within a restricted area, who is under eighteen years of age, to be exposed to airborne radioactive material in an average concentration in excess of the limits specified in Table II of WAC 402-24-220, Appendix A.
For purposes of this subdivision, concentrations may be averaged over periods not greater than 1 week.
(c) "Exposed" as used in this subdivision means that the individual is present in an airborne concentration. No allowance shall be made for the use of protective clothing or equipment, or particle size.
(5) Precautionary procedures and personal monitoring.
(a) Every employer must make such surveys as may be necessary for him to comply with the provisions in this section. "Survey" means an evaluation of the radiation hazards incident to the production, use, release, disposal, or presence of radioactive materials or other sources of radiation under a specific set of conditions. When appropriate, such evaluation includes a physical survey of the location of materials and equipment, and measurements of levels of radiation or concentrations of radioactive material present.
(b) Every employer must supply appropriate personnel monitoring equipment, such as film badges, pocket chambers, pocket dosimeters, or film rings, to, and must require the use of such equipment by:
(i) Each employee who enters a restricted area under such circumstances that he receives, or is likely to receive, a dose in any calendar quarter in excess of twenty-five percent of the applicable value specified in subsection (3)(a) of this section; and
(ii) Each employee under eighteen years of age who enters a restricted area under such circumstances that he receives, or is likely to receive a dose in any calendar quarter in excess of five percent of the applicable value specified in subsection (3)(a) of this section; and
(iii) Each employee who enters a high radiation area.
(c) As used in this section:
(i) Personnel monitoring equipment. Devices designed to be worn or carried by an individual for the purpose of measuring the dose received (e.g., film badges, pocket chambers, pocket dosimeters, film rings, etc.);
(ii) Radiation area. Any area, accessible to personnel, in which there exists radiation at such levels that a major portion of the body could receive in any 1 hour a dose in excess of 5 millirem, or in any five consecutive days a dose in excess of 100 millirem; and
(iii) High radiation area. Any area, accessible to personnel, in which there exists radiation at such levels that a major portion of the body could receive in any one hour a dose in excess of 100 millirem.
(6) Caution signs, labels and signals.
(a) General.
(i) Symbols prescribed by this subsection must use the conventional radiation caution colors (magenta or purple on yellow background). The symbol prescribed by this subsection is the conventional three-bladed design:
RADIATION SYMBOL
1. Cross-hatched area is to be magenta or purple.
2. Background is to be yellow.
(ii) In addition to the contents of signs and labels prescribed in this subsection, employers may provide on or near such signs and labels any additional information which may be appropriate in aiding individuals to minimize exposure to radiation or to radioactive material.
(b) Radiation area. Each radiation area must be conspicuously posted with a sign or signs bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
RADIATION AREA
(c) High radiation area.
(i) Each high radiation area must be conspicuously posted with a sign or signs bearing the radiation caution symbol and the words:
CAUTION
HIGH RADIATION AREA
(ii) Each high radiation area must be equipped with a control device which must either cause the level of radiation to be reduced below that at which an individual might receive a dose of 100 millirems in one hour upon entry into the area or must energize a conspicuous visible or audible alarm signal in such a manner that the individual entering and the employer or a supervisor of the activity are made aware of the entry. In the case of a high radiation area established for a period of thirty days or less, such control device is not required.
(d) Airborne radioactivity area.
(i) As used in the provisions of this section, "airborne radioactivity area" means:
(A) Any room, enclosure, or operating area in which airborne radioactive materials, composed wholly or partly of radioactive material, exist in concentrations in excess of the amounts specified in column 1 of Table I of WAC 402-24-220, Appendix A.
(B) Any room, enclosure, or operating area in which airborne radioactive materials exist in concentrations which, averaged over the number of hours in any week during which individuals are in the area, exceed twenty-five percent of the amounts specified in column 1 of Table I of WAC 402-24-220, Appendix A.
(ii) Each airborne radioactivity area must be conspicuously posted with a sign or signs bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
AIRBORNE RADIOACTIVITY AREA
(e) Additional requirements.
(i) Each area or room in which radioactive material is used or stored and which contains any radioactive material (other than natural uranium or thorium) in any amount exceeding ten times the quantity of such material specified in WAC 402-24-230, Appendix B must be conspicuously posted with a sign or signs bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
RADIOACTIVE MATERIALS
(ii) Each area or room in which natural uranium or thorium is used or stored in an amount exceeding one hundred times the quantity of such material specified in chapter 402-24 WAC must be conspicuously posted with a sign or signs bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
RADIOACTIVE MATERIALS
(f) Containers.
(i) Each container in which is transported, stored, or used a quantity of any radioactive material (other than natural uranium or thorium) greater than the quantity of such material specified in WAC 402-24-230, Appendix B must bear a durable, clearly visible label bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
RADIOACTIVE MATERIALS
(ii) Each container in which natural uranium or thorium is transported, stored, or used in a quantity greater than ten times the quantity specified in WAC 402-24-230, Appendix B must bear a durable, clearly visible label bearing the radiation caution symbol described in subdivision (a) of this subsection and the words:
CAUTION
RADIOACTIVE MATERIALS
(iii) Notwithstanding the provisions of items (i) and (ii) of this subdivision a label shall not be required:
(A) If the concentration of the material in the container does not exceed that specified in column 2 of Table I of WAC 402-24-220, Appendix A.
(B) For laboratory containers, such as beakers, flasks, and test tubes, used transiently in laboratory procedures, when the user is present.
(iv) Where containers are used for storage, the labels required in this subdivision must state also the quantities and kinds of radioactive materials in the containers and the date of measurement of the quantities.
(7) Immediate evacuation warning signal.
(a) Signal characteristics.
(i) The signal must be a midfrequency complex sound wave amplitude modulated at a subsonic frequency. The complex sound wave in free space must have a fundamental frequency f1 between 450 and 500 hertz (Hz) modulated at a subsonic rate between 4 and 5 hertz.
(ii) The signal generator must not be less than 75 decibels at every location where an individual may be present whose immediate, rapid, and complete evacuation is essential.
(iii) A sufficient number of signal units must be installed such that the requirements of item (i) of this subdivision are met at every location where an individual may be present whose immediate, rapid, and complete evacuation is essential.
(iv) The signal must be unique in the plant or facility in which it is installed.
(v) The minimum duration of the signal must be sufficient to insure that all affected persons hear the signal.
(vi) The signal-generating system must respond automatically to an initiating event without requiring any human action to sound the signal.
(b) Design objectives.
(i) The signal-generating system must be designed to incorporate components which enable the system to produce the desired signal each time it is activated within one-half second of activation.
(ii) The signal-generating system must be provided with an automatically activated secondary power supply which is adequate to simultaneously power all emergency equipment to which it is connected, if operation during power failure is necessary, except in those systems using batteries as the primary source of power.
(iii) All components of the signal-generating system must be located to provide maximum practicable protection against damage in case of fire, explosion, corrosive atmosphere, or other environmental extremes consistent with adequate system performance.
(iv) The signal-generating system must be designed with the minimum number of components necessary to make it function as intended, and should utilize components which do not require frequent servicing such as lubrication or cleaning.
(v) Where several activating devices feed activating information to a central signal generator, failure of any activating device must not render the signal-generator system inoperable to activating information from the remaining devices.
(vi) The signal-generating system must be designed to enhance the probability that alarm occurs only when immediate evacuation is warranted. The number of false alarms must not be so great that the signal will come to be disregarded and shall be low enough to minimize personal injuries or excessive property damage that might result from such evacuation.
(c) Testing.
(i) Initial tests, inspections, and checks of the signal-generating system must be made to verify that the fabrication and installation were made in accordance with design plans and specifications and to develop a thorough knowledge of the performance of the system and all components under normal and hostile conditions.
(ii) Once the system has been placed in service, periodic tests, inspections, and checks must be made to minimize the possibility of malfunction.
(iii) Following significant alterations or revisions to the system, tests and checks similar to the initial installation tests must be made.
(iv) Tests must be designed to minimize hazards while conducting the tests.
(v) Prior to normal operation the signal-generating system shall be checked physically and functionally to ensure reliability and to demonstrate accuracy and performance. Specific tests must include:
(A) All power sources.
(B) Calibration and calibration stability.
(C) Trip levels and stability.
(D) Continuity of function with loss and return of required services such as AC or DC power, air pressure, etc.
(E) All indicators.
(F) Trouble indicator circuits and signals, where used.
(G) Air pressure (if used).
(H) Determine that sound level of the signal is within the limit of item (a)(ii) of this subsection at all points that require immediate evacuation.
(vi) In addition to the initial startup and operating tests, periodic scheduled performance tests and status checks must be made to ensure that the system is at all times operating within design limits and capable of the required response. Specific periodic tests or checks or both must include:
(A) Adequacy of signal activation device.
(B) All power sources.
(C) Function of all alarm circuits and trouble indicator circuits including trip levels.
(D) Air pressure (if used).
(E) Function of entire system including operation without power where required.
(F) Complete operational tests including sounding of the signal and determination that sound levels are adequate.
(vii) Periodic tests must be scheduled on the basis of need, experience, difficulty, and disruption of operations. The entire system should be operationally tested at least quarterly.
(viii) All employees whose work may necessitate their presence in an area covered by the signal shall be made familiar with the actual sound of the signal—preferably as it sounds at their work location. Before placing the system into operation, all employees normally working in the area must be made acquainted with the signal by actual demonstration at their work locations.
(8) Exceptions from posting requirements. Notwithstanding the provisions of subsection (6) of this section:
(a) A room or area is not required to be posted with a caution sign because of the presence of a sealed source, provided the radiation level twelve inches from the surface of the source container or housing does not exceed 5 millirem per hour.
(b) Rooms or other areas in onsite medical facilities are not required to be posted with caution signs because of the presence of patients containing radioactive material, provided that there are personnel in attendance who must take the precautions necessary to prevent the exposure of any individual to radiation or radioactive material in excess of the limits established in the provisions of this section.
(c) Caution signs are not required to be posted at areas or rooms containing radioactive materials for periods of less than 8 hours: Provided, that
(i) The materials are constantly attended during such periods by an individual who must take the precautions necessary to prevent the exposure of any individual to radiation or radioactive materials in excess of the limits established in the provisions of this section; and
(ii) Such area or room is subject to the employer's control.
(9) Exemptions for radioactive materials packaged for shipment. Radioactive materials packaged and labeled in accordance with regulations of the Department of Transportation published in 49 C.F.R. Chapter I, are exempt from the labeling and posting requirements of this section during shipment, provided that the inside containers are labeled in accordance with the provisions of subsection (6) of this section.
(10) Instruction of personnel, posting.
(a) Employers regulated by the Nuclear Regulatory Commission shall be governed by 10 C.F.R. Part 20 standards. Employers conducting business in Washington state must be governed by the requirements of the laws and regulations of the state. All other employers must be regulated by the following:
(b) All individuals working in or frequenting any portion of a radiation area must be informed of the occurrence of radioactive materials or of radiation in such portions of the radiation area; must be instructed in the safety problems associated with exposure to such materials or radiation and in precautions or devices to minimize exposure; must be instructed in the applicable provisions of this section for the protection of employees from exposure to radiation or radioactive materials; and must be advised of reports of radiation exposure which employees may request pursuant to the regulations in this section.
(c) Each employer to whom this section applies must post a current copy of its provisions and a copy of the operating procedures applicable to the work conspicuously in such locations as to ensure that employees working in or frequenting radiation areas will observe these documents on the way to and from their place of employment, or must keep such documents available for examination of employees upon request.
(11) Storage of radioactive materials. Radioactive materials stored in a nonradiation area must be secured against unauthorized removal from the place of storage.
(12) Waste disposal. No employer must dispose of radioactive material except as provided for in WAC 402-24-130.
(13) Notification of incidents.
(a) Immediate notification. Each employer must immediately notify the industrial hygiene section, division of industrial safety and health for employees not protected by the Nuclear Regulatory Commission by means of 10 C.F.R. Part 20; subsection (2)(b) of this section by telephone or telegraph of any incident involving radiation which may have caused or threatens to cause:
(i) Exposure of the whole body of any individual to 25 rems or more of radiation; exposure of the skin of the whole body of any individual to 150 rems or more of radiation; or exposure of the feet, ankles, hands, or forearms of any individual to 375 rems or more of radiation; or
(ii) The release of radioactive material in concentrations which, if averaged over a period of twenty-four hours, would exceed 5,000 times the limit specified for such materials in Table II of WAC 402-24-220, Appendix A.
(iii) A loss of 1 working week or more of the operation of any facilities affected; or
(iv) Damage to property in excess of $100,000.
(b) Twenty-four hour notification. Each employer must within twenty-four hours following its occurrence notify the industrial hygiene section, division of industrial safety and health, for employees not protected by the Nuclear Regulatory Commission by means of 10 C.F.R. Part 20; subsection (2)(b) of this section, by telephone or telegraph of any incident involving radiation which may have caused or threatens to cause:
(i) Exposure of the whole body of any individual to 5 rems or more of radiation; exposure of the skin of the whole body of any individual to 30 rems or more of radiation; or exposure of the feet, ankles, hands, or forearms to 75 rems or more of radiation; or
(ii) A loss of one day or more of the operation of any facilities; or
(iii) Damage to property in excess of $10,000.
(14) Reports of overexposure and excessive levels and concentrations.
(a) In addition to any notification required by subsection (13) of this section each employer must make a report in writing within thirty days to the industrial hygiene section division of industrial safety and health, for employees not protected by the Nuclear Regulatory Commission by means of 10 C.F.R. Part 20; or under subsection (2)(b) of this section, of each exposure of an individual to radiation or concentrations of radioactive material in excess of any applicable limit in this section. Each report required under this subdivision must describe the extent of exposure of persons to radiation or to radioactive material; levels of radiation and concentration of radioactive material involved, the cause of the exposure, levels of concentrations; and corrective steps taken or planned to ensure against a recurrence.
(b) In any case where an employer is required pursuant to the provisions of this subsection to report to the industrial hygiene section, division of industrial safety and health, any exposure of an individual to radiation or to concentrations of radioactive material, the employer must also notify such individual of the nature and extent of exposure. Such notice must be in writing and must contain the following statement: "You should preserve this report for future reference."
(15) Records.
(a) Every employer must maintain records of the radiation exposure of all employees for whom personnel monitoring is required under subsection (5) of this section and advise each of his employees of his individual exposure on at least an annual basis.
(b) Every employer must maintain records in the same units used in tables in subsection (2) of this section and WAC 402-24-220, Appendix A.
(16) Disclosure to former employee of individual employee's record.
(a) At the request of a former employee an employer must furnish to the employee a report of the employee's exposure to radiation as shown in records maintained by the employer pursuant to subdivision (15)(a) of this section. Such report must be furnished within thirty days from the time the request is made, and must cover each calendar quarter of the individual's employment involving exposure to radiation or such lesser period as may be requested by the employee. The report must also include the results of any calculations and analysis of radioactive material deposited in the body of the employee. The report must be in writing and contain the following statement: "You should preserve this report for future reference."
(b) The former employee's request should include appropriate identifying data, such as Social Security number and dates and locations of employment.
(17) (Reserved)
(18) Radiation standards for mining.
(a) For the purpose of this subsection, a "working level" is defined as any combination of radon daughters in 1 liter of air which will result in the ultimate emission of 1.3 X 105 million electron volts of potential alpha energy. The numerical value of the "working level" is derived from the alpha energy released by the total decay of short-lived radon daughter products in equilibrium with 100 picocuries of radon 222 per liter of air. A working level month is defined as the exposure received by a worker breathing air at one working level concentration for 4-1/3 weeks of forty hours each.
(b) Occupational exposure to radon daughters in mines must be controlled so that no individual will receive an exposure of more than two working level months in any calendar quarter and no more than four working level months in any calendar year. Actual exposures must be kept as far below these values as practicable.
(c)(i) For uranium mines, records of environmental concentrations in the occupied parts of the mine, and of the time spent in each area by each person involved in an underground work must be established and maintained. These records must be in sufficient detail to permit calculations of the exposures, in units of working level months, of the individuals and shall be available for inspection by the industrial hygiene section, division of safety and health or their authorized representatives.
(ii) For other than uranium mines and for surface workers in all mines, item (i) of this subdivision will be applicable: Provided, however, That if no environmental sample shows a concentration greater than 0.33 working level in any occupied part of the mine, the maintenance of individual occupancy records and the calculation of individual exposures will not be required.
(d)(i) At the request of an employee (or former employee) a report of the employee's exposure to radiation as shown in records maintained by the employer pursuant to subdivision (c) of this subsection must be furnished to them. The report must be in writing and contain the following statement:
"This report is furnished to you under the provisions of the state of Washington, Ionizing Radiation Safety and Health Standards (chapter 296-62 WAC). You should preserve this report for future reference."
(ii) The former employee's request should include appropriate identifying data, such as Social Security number and dates and locations of employment. See tables in WAC 402-24-220, Appendix A and 402-24-230, Appendix B.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 19-01-094, § 296-62-09004, filed 12/18/18, effective 1/18/19. Statutory Authority: RCW 49.17.040 and 49.17.050. WSR 85-01-022 (Order 84-24), § 296-62-09004, filed 12/11/84; Order 75-15, § 296-62-09004, filed 4/18/75.]
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