Journal of Medical Physics and Applied Sciences

Study of the Different Modes of the External Exposure to the Terrestrial Gamma Rays at Seila Area, Southeastern Desert, Egypt

Uranium activity concentration in the granitic rocks at a studied location at Seila area ranged between 161 and 2778 (Bq/kg) with an average of 1163 (Bq/kg). Several modes and configurations were suggested to evaluate the effective dose rates received externally by the workers exposed to the gamma rays emitted fromthe studied granites. Precisely described exposure configurations can prevent any undesired overestimation of the effective doses received by the workers. Using such configurations reduced the estimated effective dose rate from 1.12 to almost its half value, 0.58 (μSv/h). However, all modes of exposure to the terrestrial gamma rays at Seila area result in occupational effective doses which are below the recommended limits. It is unlikely that the transport of the granitic rocks from Seila area causes any considerable exposures to the occupants or to the environment.

Author(s):

Abdel-Razek YA

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