DHS 157.37(2)(b)(b) Each sealed source storage container and source changer shall have a lock or outer locked container designed to prevent unauthorized or accidental removal of the sealed source from its shielded position. Storage containers and source changers shall be kept locked when containing sealed sources except when under the direct surveillance of a radiographer or a radiographer’s assistant. If a keyed lock, the key shall be removed at all times.

DHS 157.37(2)(c)(c) The control panel of all portable radiation machines shall be equipped with a lock that will prevent the unauthorized use of an x-ray system or the accidental production of radiation. The radiation machine shall be kept locked and the key removed at all times except when under the direct visual surveillance of a radiographer or a radiographer’s assistant.

DHS 157.38(1)(1) Requirement. A licensee shall keep sufficient calibrated and operable radiation survey instruments at each location where sources of radiation are present to make the radiation surveys required by this subchapter and subch. III. Instrumentation required by this subchapter shall be capable of measuring a range from 0.02 millisieverts (2 mrem) per hour through 0.01 sievert (1 rem) per hour.

DHS 157.38(2)(a)(a) A licensee shall have each radiation survey instrument calibrated for all the following:

DHS 157.38(2)(a)2.2. 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 mid-range of each decade and at 2 points of at least one decade; and for digital instruments at 3 points between 0.02 and 10 millisieverts (2 and 1000 mrem) per hour.

DHS 157.38(2)(b)(b) Accuracy within plus or minus 20% of the true radiation dose rate shall be demonstrated at each point checked.

DHS 157.39(1)(a)(a) The replacement of any sealed source fastened to or contained in a radiographic exposure device and leak testing of any sealed source shall be performed by persons authorized to do so by the department, the nuclear regulatory commission or another agreement state.

DHS 157.39(1)(b)(b) The opening, repair or modification of any sealed source shall be performed by persons specifically authorized to do so by the department, the nuclear regulatory commission or another agreement state.

DHS 157.39(2)(a)(a) A licensee who uses a sealed source shall have the source tested for leakage at intervals not to exceed 6 months. The leak testing of the source shall be performed using a method approved by the department, the nuclear regulatory commission or by another agreement state. The wipe sample should be taken from the nearest accessible point to the sealed source where contamination might accumulate. The wipe sample shall be analyzed for radioactive contamination. The analysis shall be capable of detecting the presence of 185 becquerel (0.005 mCi) of radioactive material on the test sample and shall be performed by a person specifically authorized by the department, the US nuclear regulatory commission or another agreement state to perform the analysis.

DHS 157.39(2)(b)(b) A licensee shall maintain records of the leak tests for 3 years.

DHS 157.39(2)(c)(c) Unless a sealed source is accompanied by a certificate from the transferor that shows that it has been leak tested within 6 months before the transfer, it may not be used by the licensee until tested for leakage. Sealed sources that are in storage and not in use do not require leak testing, but shall be tested before use or transfer to another person if the interval of storage exceeds 6 months.

DHS 157.39(2)(d)(d) Any leak test that reveals the presence of 185 becquerel (0.005 mCi) or more of removable radioactive material shall be considered evidence that the sealed source is leaking. The licensee shall immediately withdraw the equipment involved from use and shall have it decontaminated and repaired, or disposed of. A report must be filed with the department within 5 days of any test with results that exceed the threshold in this paragraph, describing the equipment involved, the test results and the corrective action taken.

DHS 157.39(2)(e)1.1. Each exposure device using depleted uranium shielding and an “S” tube configuration shall be tested for DU contamination at intervals not to exceed 12 months. The analysis shall be capable of detecting the presence of 185 becquerel (0.005 mCi) of radioactive material on the test sample and shall be performed by a person specifically authorized by the department, the nuclear regulatory commission or another agreement state to perform the analysis. If the testing reveals the presence of DU contamination, the exposure device shall be removed from use until an evaluation of the wear of the S-tube has been made. If the evaluation reveals that the S-tube is worn through, the device may not be used again.

DHS 157.39(2)(e)2.2. DU shielded devices need not be tested for DU contamination while not in use and in storage. If the DU shielded device has not been used and in storage for more than 12 months, the device shall be tested for DU contamination before using or transferring the device. A record of the DU leak-test shall be retained for 3 years.

DHS 157.40(1)(1) Requirement. A licensee shall conduct a quarterly physical inventory to account for all sources of radiation and for devices, including devices containing depleted uranium, received and possessed under the license.

DHS 157.40(2)(2) Records. A licensee shall maintain records of the quarterly inventory for 3 years. The record shall include the date of the inventory, name of the individual conducting the inventory, radionuclide, source activity in becquerels or curies or mass of DU in each device, location of the sources and devices, manufacturer, model and serial number of each source of radiation.

DHS 157.41DHS 157.41 Inspection and maintenance of radiation machines, radiographic exposure devices, transport and storage containers, associated equipment, source changers and survey instruments.