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A Shield Testing Program is being conducted at a new nuclear facility to verify that shield walls, doors, and windows meet the design criteria for radiation attenuation. A modified Teletherapy Unit is being utilized as a test unit. This unit has been successfully used for shield testing during the construction of two other major facilities. A collimated beam from a Co60 source is exposed on one side of the shield being tested, and the attenuated radiation is measured with a standard radiation detector. Detailed documentation is completed for each area tested. Detailed procedures are required for operation of the test unit. No significant personnel exposure has been recorded during any of the shield testing.
The Co60 test method is a known, proven technique that provides the required penetration and the capability to cover relatively large areas with a single exposure.
Senior Engineer, Westinghouse Idaho Nuclear Company, Idaho Falls, ID
Stock #: JTE11902J