Comparison results for absorbed dose mapping of the Co<^>60 industrial radiation facility BULGAMMA of Sopharma PLC, Bulgaria using a practical and computational dosimetry are presented in the paper. The gamma radiation facility is based on JS-8500 Co<^>60 irradiator produced by MDS Nordian, Canada. The absorbed dose distributions of gamma rays in an irradiated product on JS-8500 Co<^>60 irradiator have been calculated using the ModeGR Monte Carlo software. The software ModeGR was designed specially for simulation of the absorbed dose distribution within multi-layer packages irradiated with gamma ray from flat panoramic Co<^>60 source rack using a Monte Carlo method. Absorbed dose measurements into containers filled with material using Ethanol Chlorobenzene chemical dosimeters were carried out to validate the software ModeGR. The comparison results show that software ModeGR can be used as a predictive tool for detailed dose mapping in gamma irradiated product.

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