PEMANTAUAN LAJU DOSIS PAPARAN RADIASI BETA DAN GAMA DI INSTALASI KEDOKTERAN NUKLIR

Abstract

Monitoring of dose rate beta and gama radiation exposure in nuclear medicine installation so that the received beta and gama doses can be estimated workers during work. Measurements were carried out in 2 stages: a detector without a filter and a 1.5 mm thick Aluminum beta-blocking filter. Distance is measured by the position of the worker at work. The results of measurements without a filter obtained a dose rate (H'(0.07) and H*(10)), and measurements with a filter obtained a dose rate of H*(10). The dose rate of beta radiation exposure (0.07) was obtained from the difference between the results of the first and second measurements, and the results were multiplied by a correction factor. The real dose rate in the room can be determined through the dose rate adjusted to the background dose rate and multiplied by the calibration factor of the measuring instrument. The results of the measurement of the dose H'(0.07) were 0.03 – 5608.77 Sv/hour and dose H*(10) was 0.02 – 68.65 Sv/hour. With the exposure dose rate that exceeds, workers, are at risk of receiving directed equivalent doses of H'(0.07) and ambient H*(10) that exceed the dose limit set by BAPETEN of 500 mSv/year for H'(0.07) and 20 mSv/year for H*(10). Therefore, routine monitoring of beta and gama radiation exposure in nuclear medicine installations needs to be carried out to prevent and minimize the occurrence of excessive beta and gama radiation exposure doses received by workers. Keywords: H’(0,07), H*(10), Nuclear Medicine