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Hazardous Substances Act, 1973 (Act No. 15 of 1973)

Group IV Hazardous Substances Regulations

Chapter 4 : Safety Standards and Obligations of Persons with regard to Group IV Hazardous Substances

22. Dose limits and dosimetry

 

 

1) Every holder of an authority shall estimate all potential doses of ionising radiation to which an employee or any other person who enters such holder's premise or premises where ionising radiation is present may be exposed.

 

2)
a) Every holder shall issue a dosimeter, obtained from a dosimetry service, to every registered radiation worker in his employ and shall include in the internal rules instructions concerning the wearing of such meter on the radiation worker's person.
b) Any person to whom a dosimeter has been issued in terms of paragraph (a) shall be obliged to wear such meter on his person at all times while working with or handling a Group IV hazardous substance.

 

3) Every holder shall ensure that a dosimetry service replaces a dosimeter--
a) at regular intervals not exceeding 32 days; or
b) when an exposure larger than four millisievert has or is suspected to have occurred.

 

4) In any case where a dosimeter has been lost or destroyed or where it is not possible to assess the dose received over any period by an employee, the holder shall investigate the circumstances of the case for the purpose of assessing the dose received by the employee during that period and shall apply to the Director-General for a special entry to be made in the dose record of that employee.

 

5) Where a holder has reason to believe that the dose that may have been received by one of his employees differs from the dose record, he shall investigate the circumstances of the exposure of that employee to ionising radiation and, if that investigation confirms his suspicion, he shall apply to the Director-General for a special entry to be made in the dose record of that employee.

 

6) A holder shall keep such dose record for at least five years from the end of the calender year to which the dose record relates.

 

7)
a) If an employee is likely to receive a dose in excess of 0,2 millisievert during one day, the holder concerned shall, in addition to the personal dosimeter prescribed by subregulation (2)(a), also issue to him a direct-reading dosimeter with full-scale deflections of at least two millisievert, and the holder shall take steps to ensure that the employee wears the direct-reading dosimeter while he is working with a Group IV hazardous substance.
b) Any person to whom a direct-reading dosimeter has been issued in terms of paragraph (a) shall be obliged to wear such meter on his person at all times while working with or handling a Group IV hazardous substance.

 

8) A holder shall ensure that direct-reading dosimeters are read at least once a day during use and that accurate records of the radiation doses are recorded in a logbook and that such dosimeters are calibrated at intervals not exceeding 26 months by a body or person approved by the Director-General.