European Academic Research ISSN 2286-4822
ISSN-L 2286-4822
Impact Factor: 3.4546 (UIF)
DRJI Value : 5.9 (B+)
Article Details :
Article Name :
Analysis of Dose Distribution for the Gamma Krypton -85 Irradiation in Normal Conditions with Estimation of Cancer Risk Factor. A Case Study
Author Name :
AMAAL A. TAWFIK H. EL-SHANSHOURY
Publisher :
Bridge Center
Article URL :
Abstract :
The aim of this work is to protect the workers from exposure to the ionizing radiation where one of principles of radiation protection is estimating the doses which workers are exposed. These doses must be under Individual Dose Limitation. The annual limits allowed by the competent national authorities shall be established taking into account the limits established by the International Atomic Energy Agency. The dose distribution at the working place, one of the Egyptian companies in Alexandria to produce medical products, for measuring plastic thickness was experimentally and theoretically determined. RadPro Calculator Version3.26 was used to calculate the dose distributions in normal operation. The dose distribution inside the unit was measured during the operation by using AD6-6150 Automess Survey Meter and Survey Meter-Inspector EXP+ (for measuring gamma). The comparison between measuring and theoretical results has been done. Theoretical and measuring data obtained have been compared with IAEA safety standard (GSR-part 3). The results indicate good agreement between the measurements and theoretical calculation. Where at 10cm from the source, the effective dose rate was (6.5µSv/h) theoretically. The average measured effective dose rate at the same distance (the nearest distance to the source) was (7.45-7.40 µSv/h).This means that the theoretical and measured readings are convergent and lower than the effective dose rate. The measured effective dose rate was done by Direct Reading Pocket Dosimeters with average of (7.0 µSv/h). For occupational exposure of workers over the age of 18 years, the effective dose rate was (10µSv/h) or (20mSv/y).The risk factor has been calculated and the obtained data was the lifetime risk of cancer death is nearly 5% per man-sievert for persons in working age i.e. 0.0891 man may have cancer from this dose when workers exposed to Kr-85 source with activity (200mCi) after (10 years).
Keywords :
irradiation, effective dose, Krypton-85, radiation protection, risk factor.

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