Operation Bedrock: on-site radiological safety report, July 1974--June 1975

Bedrock was the name assigned to the series of underground nuclear experiments conducted at the Nevada Test Site from July 1, 1974 to June 30, 1975. This report covers the tests publicly announced by the United States Energy Research and Development Administration. Remote radiation measurements were taken during and after each nuclear experiment by a telemetry system. Monitors with portable radiation detection instruments surveyed reentry routes into ground zeroes before other planned entries were made. Continuous surveillance was provided while personnel were in radiation areas and appropriate precautions were taken to protect persons from unnecessary exposure to radiation and toxic gases. Protective clothing and equipment were issued as needed. Complete radiological safety and industrial hygiene coverage was provided during drilling and mineback operations. Telemetered and portable radiation detector measurements are listed. Detection instrumentation used is described and specific operational procedures are defined