DHS 157.51 HistoryHistory: CR 01-108: cr. Register July 2002 No. 559, eff. 8-1-02; CR 06-021: renum. (1) to be (1) (a) and am. (1) (a) (intro.) to 2., cr. (1) (b) and (c) Register October 2006 No. 610, eff. 11-1-06; correction in (1) (a) 2. made under s. 13.92 (4) (b) 7., Stats., Register March 2014 No. 699; CR 22-015: am. (1) (a) 2. Register June 2023 No. 810, eff. 7-1-23. DHS 157.52(1)(1) Limits on levels of radiation. Sources of radiation shall be used, stored and transported in accordance with the transportation requirements of subch. XIII and the dose limitation requirements of subch. III. DHS 157.52(2)(a)(a) Each source of radiation, except accelerators, shall be provided with a storage or transport container. The container shall be equipped with a lock, or tamper seal for calibration sources, to prevent unauthorized removal of or exposure to the source of radiation. DHS 157.52(2)(b)(b) A source of radiation shall be stored in a manner that minimizes danger from explosion or fire. DHS 157.52(3)(3) Transport precautions. A transport container shall be physically secured to the transporting vehicle to prevent accidental loss, tampering or unauthorized removal. DHS 157.52(4)(a)(a) A licensee or registrant shall maintain sufficient calibrated and operable radiation survey instruments at each field station and temporary job site to make physical radiation surveys as required by this subchapter and by s. DHS 157.25 (1). Instrumentation shall be capable of measuring one microsieverts (0.1 millirem) per hour through at least 0.5 millisieverts (50 millirem) per hour. DHS 157.52(4)(b)(b) Each radiation survey instrument shall be calibrated according to all the following requirements: DHS 157.52(4)(b)2.2. At intervals not to exceed 12 months and after each instrument servicing. DHS 157.52(4)(b)3.3. For linear scale instruments, at 2 points located approximately one-third and two-thirds of full-scale on each scale; for logarithmic scale instruments, at midrange of each decade, and at 2 points of at least one decade; and for digital instruments, at appropriate points. DHS 157.52(4)(c)(c) Calibration records shall be maintained for a period of 3 years after the calibration date for inspection by the department. DHS 157.52(4)(d)(d) A licensee or registrant shall have available additional calibrated and operable radiation survey instruments that are capable of detecting low radiation and contamination levels that could be encountered if a sealed source ruptured. A licensee or registrant may own the instruments or may have a written procedure to obtain them within 24 hours from another location. DHS 157.52(5)(a)(a) A licensee using sealed sources of radioactive material shall have the sources tested for leakage. Records of leak test results shall be kept in units of becquerels or microcuries and maintained for inspection by the department for 3 years after the leak test is performed or until transfer or disposal of the sealed source. DHS 157.52(5)(b)(b) Tests for leakage shall be performed only by persons specifically authorized to perform such tests by the department, the NRC, an agreement state or a licensing state. The test for leakage shall be performed using a test kit or method approved by the department, the NRC, an agreement state or a licensing state. The test sample shall be taken from the surface of the source, source holder or from the surface of the device in which the source is stored or mounted and on which one might expect contamination to accumulate. The test sample shall be analyzed for radioactive contamination and the analysis shall be capable of detecting the presence of 185 becquerels (0.005 microcurie) of radioactive material on the test sample. DHS 157.52(5)(c)(c) Each sealed source of radioactive material shall be tested at intervals not to exceed 6 months, except energy compensation sources which may be tested every 3 years. In the absence of a certificate from a transferor indicating that a test has been made prior to the transfer, the sealed source may not be put into use until tested. If, for any reason, it is suspected that a sealed source may be leaking, it shall be removed from service immediately and tested for leakage within 30 calendar days. DHS 157.52(6)(6) Leaking or contaminated sources. If leak testing of a source reveals the presence of 185 becquerels (0.005 microcurie) or more of leakage or contamination, a licensee shall immediately withdraw the source from use and shall cause it to be decontaminated, repaired or disposed of under the requirements of this chapter. A licensee shall file a written report with the department within 5 days of receiving the test results that describes the equipment involved, the test results and the corrective action taken. DHS 157.52(7)(7) Exemptions. The following sources are exempted from the requirements of subs. (5) and (6). DHS 157.52(7)(b)(b) Sources of radioactive material with a half-life of 30 days or less. DHS 157.52(7)(d)(d) Sources of beta- or gamma-emitting radioactive material with an activity of 3.7 MBq (100 microcuries) or less. DHS 157.52(7)(e)(e) Sources of alpha- or neutron emitting radioactive material with an activity of 0.370 MBq (10 microcuries) or less. DHS 157.52(8)(8) Physical inventory. A licensee or registrant shall conduct a semi-annual physical inventory to account for all sources of radiation. Records of inventories shall be maintained for 3 years from the date of the inventory for inspection by the department and shall include the quantities and kinds of sources of radiation, the location where sources of radiation are assigned, the date of the inventory and the name of the individual conducting the inventory. DHS 157.52(9)(9) Utilization records. A licensee or registrant shall maintain current records, which shall be kept available for inspection by the department for 3 years from the date of the recorded event, showing all of the following information for each source of radiation: