RADIOLOGICAL SAFETY Radiological safety for the tests was based on adapting then-current safety principles and procedures to the environment of a large field operation. The protective measures were derived from: 1. Recommendations of national and international advisory bodies on radiation exposure limits 2. Regulations issued by Commander, Joint Task Force 7 (CITF 7) based on these recommendations 3. Administrative rules and controls that implemented these regulations. Methods to limit human exposure to radiation were based on the use of both physical safeguards, e.g., barriers to restrict access to radiation exclusion (radex) areas, and procedural controls, e.g., training to acquaint personnel with the problems of radiation. This chapter explains the regu- lations, administrative rules, and procedures used by JTF 7 to limit exposure and measure the effectiveness of the controls. The concept of radiological safety (radsafe) for Operation CASTLE re- quired each task unit to provide for its own safety under directives issued by CUOTF 7. _ Each task unit was delegated support functions for the benefit of the task force as a whole, but task units were basically selfsufficient in manpower, maintenance, and training (Reference 9, Appen- dix B). The CJTF 7 radsafe directives had three underlying objectives ence 16, p. l. 5): Maintenance of personnel radiation exposures at the lowest possible level consistent with medical knowledge of radiation effects and the importance of the test series 74 (Refer- TSat TeTT CHAPTER 2