Our first experience with the dosimetry of eye lens at the Nuclear Medicine Department of the District Hospital in Příbram, plc.

Overview

Objective: Monitoring of radiation dose of eye lens in accordance with Act No. 263/2016 Sb. and Decree No. 422/2016 Sb.

Method: A calibrated film dosimeter from NUVIA Dosimetry, Ltd., was used to monitor the radiation dose of the eye lens. Eye dose of pharmaceutical technologist was monitored throughout the year 2018. The dosimeters were sent for evaluation once a month. The measured Hp(3) personal dose equivalent which is used for monitoring an equivalent dose of the eye lens was compared with the Hp(10) personal dose equivalent used for a whole body equivalent dose. The existence of correlation was verified by calculating Pearson correlation coefficient.

Result: The annual Hp(3) for pharm technologist FA1 is 1,83 mSv and for FA2 1,34 mSv. The annual value of Hp(10) for FA1 is 2,43 mSv and 1,80 mSv for FA2. The ratio Hp(3)/Hp(10) is equal to 0,71 on average. The Pearson correlation coefficient of personal dose equivalent Hp(3) and Hp(10) equals to ρHp(3), Hp(10) FA1 = 0,41 (p ≈ 0,18) for FA1 and ρHp(3), Hp(10) FA2 = 0,70 (p ≈ 0,01) for FA2.

Conclusion: The results suggest that in the current operation at the Department of Nuclear Medicine in Příbram, it is not expected to exceed the monitoring levels nor the dose limits for category A radiation workers according to Act No. 263/2016 Sb. and Decree 422/2016 Sb. Due to the small number of measurements and monitored

employees, the correlation between Hp(3) and Hp(10) cannot be statistically proven.

Keywords:

radiation protection – eye lens – dosimetry