6 Colo. Code Regs. § 1007-1-5.20

Current through Register Vol. 47, No. 11, June 10, 2024

Section 6 CCR 1007-1-5.20 - Personnel Monitoring

5.20.1 The licensee or registrant may not permit any individual to act as a radiographer or a radiographer's assistant unless, at all times during radiographic operations, each individual wears, on the trunk of the body, a direct reading dosimeter, an operating alarming ratemeter, and a personnel dosimeter. At permanent radiography installations where other appropriate alarming or warning devices are in routine use, or during radiographic operations using radiation machines, the wearing of an alarming ratemeter is not required.

5.20.1.1 Pocket dosimeters must have a range from zero to 2 millisievert (200 mrem) and must be recharged at the start of each shift. Electronic personal dosimeters may only be used in place of ion-chamber pocket dosimeters.

5.20.1.2 Each personnel dosimeter must be assigned to and worn by only one individual.

5.20.1.3 Film badges must be replaced at least monthly and all other personnel dosimeters that require replacement must be replaced at least quarterly.

5.20.1.4 All personnel dosimeters must be evaluated at least quarterly or promptly after replacement whichever is more frequent.

5.20.2 Direct reading dosimeters, such as pocket dosimeters or electronic personal dosimeters, must be read and the exposures recorded at the beginning and end of each shift, and records must be maintained in accordance with 5.34.

5.20.3 Pocket dosimeters, or electronic personal dosimeters, must be checked at periods not to exceed 12 months for correct response to radiation, and records must be maintained in accordance with 5.34. Acceptable dosimeters must read within plus or minus 20 percent of the true radiation exposure.

5.20.4 If an individual's pocket chamber is found to be off-scale, or if his or her electronic personal dosimeter reads greater than 2 millisieverts (200 mrem), and the possibility of radiation exposure cannot be ruled out as the cause, the individual's personnel dosimeter must be sent for processing and evaluation within 24 hours. For personnel dosimeters that do not require processing, evaluation of the dosimeter must be started within 24 hours.

5.20.4.1 In addition, the individual may not resume work associated with use of sources of radiation until a determination of the individual's radiation dose has been made. This determination must be made by the radiation safety officer or the radiation safety officer's designee.

5.20.4.1 The results of this determination must be included in the records maintained in accordance with 5.34.

5.20.5 If the personnel dosimeter that is required by 5.20.1 is lost or damaged, the worker shall cease work immediately until a replacement personnel dosimeter meeting the requirements of 5.20.1 is provided and the exposure is calculated for the time period from issuance to loss or damage of the personnel dosimeter. The results of the calculated exposure and the time period for which the personnel dosimeter was lost or damaged must be included in the records maintained in accordance with 5.34.

5.20.6 Dosimetry results must be retained in accordance with 5.34.

5.20.7 Each alarming ratemeter must:

5.20.7.1 Be checked to ensure that the alarm functions properly before using at the start of each shift;

5.20.7.2 Be set to give an audible alarm signal at a preset dose rate of 5 millisievert (500 mrem) per hour; with an accuracy of plus or minus 20 percent of the true radiation dose rate;

5.20.7.3 Require special means to change the preset alarm function; and

5.20.7.4 Be calibrated at periods not to exceed 12 months for correct response to radiation. The licensee shall maintain records of alarming ratemeter calibrations in accordance with 5.34.

6 CCR 1007-1-5.20

Colorado Register, Vol 37, No. 14. July 25, 2014, effective 8/14/2014

38 CR 02, January 25, 2015, effective 2/14/2015

38 CR 05, March 10, 2015, effective 3/30/2015

38 CR 12, June 25, 2015, effective 7/15/2015

38 CR 14, July 25, 2015, effective 8/14/2015

39 CR 02, January 25, 2016, effective 2/14/2016

39 CR 16, August 25, 2016, effective 9/14/2016

39 CR 22, November 25, 2016, effective 12/15/2016

40 CR 11, June 10, 2017, effective 6/30/2017

40 CR 20, October 25, 2017, effective 11/14/2017

42 CR 24, December 25, 2019, effective 1/14/2020

43 CR 14, July 25, 2020, effective 8/14/2020

43 CR 18, September 25, 2020, effective 10/15/2020

44 CR 11, June 10, 2021, effective 7/15/2021

44 CR 14, July 25, 2021, effective 8/14/2021

45 CR 22, November 25, 2022, effective 12/15/2022