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Description
60Co radioactive source is a kind commonly used radioactive source in industrial irradiation processing, usually with an activity of about 10 kCi per source and a total activity of about 200 kCi per individual package. Radiation shielding is an important factor considered in the design of industrial irradiation source transportation containers, and an increase in shielding thickness can lead to an increase in the volume and weight of the package, which will make operation inconvenient. The increase in shielding materials will also increase the cost of container manufacturing and transportation. A multi-layer shielding structure container combining steel-tungsten-steel-lead-steel was designed for the convenient transportation of industrial irradiation sources, taking into account factors such as volume limitations, shielding effectiveness, and manufacturing costs. The external dimensions of the shielding container responsible for shielding function in the container are φ909mm×1241mm, with a shielding material tungsten alloy thickness of 62mm, a lead layer thickness of 147.5mm, and a steel total thickness of 31mm. shielding performance testing results show that the maximum radiation level at a distance of 5cm from the outer surface of the package is 603.7 uSv/h, and at a distance of 1m from the outer surface of the package is 84.3 uSv/h, when the maximum design source quantity of the container is 6.66×1015Bq (180000 Ci). The shielding design meet the requirements of SSR-6 for B (U) type packages.
