Development of a thermoluminescent personnel monitoring system

Thermoluminescent personnel monitoring system has been developed by the Division of Radiological Protection, Bhabha Atomic Research Centre (BARC), Bombay. The system is presently in use for estimation of personnel doses of radiation workers of BARC, other units of the Department of Atomic Energy, and Defence medical units in India. The report gives salient features of the TLD personnel monitoring system. The report discusses design considerations of thermoluminescent dosimetry (TLD) badge for measurement of X and β;, γ personnel exposures, a filter combination to compensate for energy dependence of the TLD disc and angular dependence of the badge. The badge reader incorporates a semiautomatic mechanical arrangement wherein the TLD cards are read, raising the heater after positioning the TLD discs one by one. Various figures illustrate the mechanical layouts and electronics circuits used in the system. Periodic quality assurance check of the system which ensures a good reproducibility, is also described. (author)