Radiation Protection in the Mineral Extraction Industry: by National Council on Radiation Protection and Measurements

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By National Council on Radiation Protection and Measurements

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Additional info for Radiation Protection in the Mineral Extraction Industry: Recommendations of the National Council on Radiation Protection and Measurements (Ncrp, No)

Sample text

Periodic retraining is necessary, usually on a n annual basis and provides an opportunity for employees to ask questions, offer suggestions and express any concerns about the radiation aspects of their work. The extent and breadth of employee training will vary with job requirements and responsibilities. For an individual whose duties do not require presence in the radiation environment, a simple description of the working environment, protective measures to be taken and assurance of personal safety may be sufficient.

Where occupancy is very low, the threshold for providing personal monitoring can be proportionally higher. In addition to providing documentationof the individual's cumulative dose, personal monitoring results may reveal developing trends or unusual practices and may be used to verify that exposures are consistent with the facility's policies and the individual's work assignment. Personal monitoring devices include TLD badges and film badges. TLD badges are currently the preferred method of personal dosimetry in mines and mills since film badges are more sensitive to harsh environmental conditions.

In general, external radiation surveys should be performed and individual doses estimated to determine the need for personal dosimeters. Personal monitoring devices should be considered for individuals likely to receive doses in excess of ten percent of the occupational limit. As a simplified rule, personal monitoring should be provided when gamma radiation levels exceed 5 p,Gy per h. Where occupancy is very low, the threshold for providing personal monitoring can be proportionally higher. In addition to providing documentationof the individual's cumulative dose, personal monitoring results may reveal developing trends or unusual practices and may be used to verify that exposures are consistent with the facility's policies and the individual's work assignment.

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