Section 144-220-E-D-18 - Personnel monitoringA. The licensee or registrant may not permit any individual to act as a radiographer or radiographer assistant unless, at all times during radiographic operations, each individual wears, on the trunk of the body, a direct reading dosimeter or an electronic personal dosimeter, an operating alarm ratemeter, and a personnel dosimeter. At permanent radiography installations where other appropriate alarming or warning devices are in routine use, the wearing of an alarming ratemeter is not required.(1) Pocket dosimeters must have a range from zero to 2 millisieverts (200 milliroentgens) and must be recharged at the start of each work shift. Electronic personal dosimeters may only be used in place of ion-chamber pocket dosimeters.(2) Each personnel dosimeter must be assigned to and worn by only one individual.(3) Film badges must be replaced at least monthly. and all other personnel dosimeters that require replacement must be replaced at least quarterly. All personnel dosimeters must be evaluated at least quarterly or promptly after replacement, whichever is more frequent. B. 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 work shift (or day), and the accumulated doses for that day determined and recorded. The records must be maintained in accordance with Subpart E.C. 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 Subpart E. Acceptable dosimeters must read within plus or minus 20 percent of the true radiation exposure.D. If an individual's pocket dosimeter is found to be off scale, or if an individual's electronic personal dosimeter reads greater than 2 millisieverts (200 milliroentgens), and the possibility of radiation exposure cannot be ruled out as the cause, the individual's personal dosimeter that requires processing 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. In addition, the individual may not resume work associated with the use of sources of radiation until a determination of the individual's radiation exposure has been made. This determination must be made by the RSO or the RSO's designee. The results of this determination must be included in the records maintained in accordance with Subpart E.E. If personnel dosimetry is lost or damaged, the worker shall cease work immediately until a replacement personnel dosimetry is provided and the exposure is calculated for the time period from issuance to loss or damage of the personnel dosimtery. The results of the calculated exposure and the time period for which the personnel dosimetry was lost or damaged must be included in the records maintained in accordance with Subpart E.F. Dosimtery results must be retained in accordance with Subpart E.G. Each alarm ratemeter must: (1) Be checked to ensure that the alarm functions properly (sounds) before using at the start of each work shift;(2) Be set to give an alarm signal at a preset dose rate of 5 mSv/hr (500 mrem/hr) or lower; with an accuracy of plus or minus 20 percent of the true radiation dose rate;(3) Require special means to change the preset alarm function; and(4) Be calibrated at periods not to exceed 12 months for correct response to radiation. The licensee or registrant shall maintain records of alarm ratemeter calibrations in accordance with Subpart E.10-144 C.M.R. ch. 220, § E-D-18