Section 157.25. Surveys and monitoring.

 

(1)   General requirements.

(a) A licensee or registrant shall make or cause to be made all the following surveys:

1. Surveys necessary for the licensee or registrant to comply with this subchapter.

2. Surveys necessary and reasonable under the circumstances to evaluate any of the following:

a. Radiation levels.

b. Concentrations or quantities of radioactive material.

c. The potential radiological hazards.

(b) A licensee or registrant shall ensure that instruments and equipment used for quantitative radiation measurements, including dose rate and effluent monitoring, are calibrated at intervals not to exceed 12 months for the radiation measured, except when a more frequent interval is specified elsewhere in this chapter or in a license condition.

(c) All personnel dosimeters, except for direct and indirect reading pocket ionization chambers and those dosimeters used to measure the dose to any extremity, that require processing to determine the radiation dose and that are used by licensees and registrants to comply with s. DHS 157.22 (1) , with other applicable provisions of this chapter or with conditions specified in a license or registration shall be processed and evaluated by a dosimetry processor that meets both of the following conditions:

1. Holds current personnel dosimetry accreditation from the national voluntary laboratory accreditation program of the national institute of standards and technology.

2. Is approved in this accreditation process for the type of radiation or radiations included in the national voluntary laboratory accreditation program that most closely approximates the type of radiation or radiations for which the individual wearing the dosimeter is monitored.

(2)   Conditions requiring individual monitoring of external and internal occupational dose. A licensee or registrant shall monitor exposures from sources of radiation at levels sufficient to demonstrate compliance with the occupational dose limits of this subchapter. Monitoring devices may be changed quarterly, provided the assignee has not exceeded 10% of the occupational limits in s. DHS 157.22 (1) (a) . If the assignee exceeds 10% of the occupational limits, the monitoring device shall be changed monthly. As a minimum, a licensee or registrant shall do all the following:

(a) Monitor occupational exposure to radiation sources under their control and supply and require the use of individual monitoring devices by all of the following:

1. Adults likely to receive, in one year from sources external to the body, a dose in excess of 10% of the limits in s. DHS 157.22 (1) (a) . Monitoring devices shall be individually assigned and not shared.

2. Minors likely to receive in one year, from radiation sources external to the body, a deep-dose equivalent in excess of 1.0 mSv (0.1 rem), a lens-dose equivalent in excess of 1.5 mSv (0.15 rem), or a shallow-dose equivalent to the skin or to the extremities in excess of 5 mSv (0.5 rem).

3. A declared pregnant woman likely to receive, in one year from sources external to the body, a dose in excess of one mSv (0.1 rem).

4. An individual entering a high or very high radiation area.

5. An individual working within 6 feet of operating medical fluoroscopic equipment.

(b) Monitor, to determine compliance with s. DHS 157.22 (4) , the occupational intake of radioactive material by and assess the committed effective dose equivalent to all of the following individuals:

1. Adults likely to receive, in one year, an intake in excess of 10% of the applicable ALI in Table I, Columns 1 and 2, of Appendix E.

2. Minors likely to receive, in one year, a committed effective dose equivalent in excess of 1.0 mSv (100 mrem).

3. Declared pregnant women likely to receive, during the entire pregnancy, a committed dose equivalent in excess of 1.0 mSv (100 mrem).

(3)   Location of individual monitoring devices. A licensee or registrant shall ensure that individuals who are required to monitor occupational doses under sub. (2) wear individual monitoring devices as follows:

(a) An individual monitoring device used for monitoring the dose to the whole body shall be worn at the unshielded location of the whole body likely to receive the highest exposure.

(b) If a protective apron is worn, the individual monitoring device shall be located at the neck, which is the collar. If a second monitoring device is used, for the same purpose, it shall be located under the protective apron at the waist. The estimated effective dose equivalent ( H E ) when wearing 2 monitoring devices, one located outside and one under a protective apron, shall be calculated using the following formula: H E (estimate) = 1.5 H W + 0.04 H N where H W = badge reading from the waist badge under the apron and H N = badge reading from the neck badge worn outside the apron.

(c) An individual monitoring device used for monitoring the dose to an embryo or fetus of a declared pregnant woman, under s. DHS 157.22 (8) (a) , shall be located at the waist under any protective apron being worn by the woman.

(d) An individual monitoring device used for monitoring the lens dose equivalent, to demonstrate compliance with s. DHS 157.22 (1) (a) 2. a. , shall be located at the neck or collar, outside any protective apron being worn by the monitored individual or at an unshielded location closer to the eye.

(e) An individual monitoring device used for monitoring the dose to the extremities, to demonstrate compliance with s. DHS 157.22 (1) (a) 2. b. , shall be worn on the extremity likely to receive the highest exposure. Each individual monitoring device shall be oriented to measure the highest dose to the extremity being monitored.

CR 01-108 : cr. Register July 2002 No. 559 , eff. 8-1-02; correction in (2) (a) 2. made under s. 13.93 (2m) (b) 7., Stats., Register July 2002 No. 559 ; CR 06-021 : r. and recr. (2) (a) 2., Register October 2006 No. 610 , eff. 11-1-06; CR 09-062 : r. (2) (a) 6. Register April 2010 No. 652 , eff. 5-1-10.