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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