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BIOLOGY AND MEDICINE 11 plant after exposure to lethal doses of 900 r, as well as possible implications regarding treatment of some human diseases. The irra- diation that kills 50 per cent of mice in 30 days can be doubled with MEG protection and nearly doubled with bone-marrow treatment. With chemical protection followed by bone-marrow treatment, the dose of irradiation that it takes to kill 50 per cent of mice in 30 days can nearly be tripled. MEG reduced the effect of a lethal dose of 900-r X irradiation on the bone marrow, spleen, thymus, and body weight by about a factor of 2. MEG is not effective when given after irradiation. Bone-mar row injection was primarily responsible for replacing the destroyed bone marrow. It is not effective when given before irradia- tion. In combined treatment, the animal received the advantages of both types of therapy and survived much greater exposure. PHYSICAL PRINCIPLES OF RADIOLOGICAL SAFETY (Radioisotopes Series) See page 75 RADIATION PROTECTION IN NUCLEAR MEDICINE (1962). 45 min- utes, color. Produced by Fordel Films, New York, for the Bureau of Medi- cine and Surgery of the U. S. Navy. Sale inquiries should be directed to the Naval Photographic Center. Available for loan (free) from USAEC headquarters and field libraries, and from the Medical Film Section, Audio-Visual Division, Naval Medical School, Bethesda, Md. 20545. Naval personnel can borrow the film from appropriate naval film libraries. Cleared for tele- vision. This semitechnical film demonstrates the procedures devised for naval hospitals to protect against the gamma radiation emitted from mate- rials used in radiation therapy. However, its principles are applicable in all hospitals. The practices demonstrated are based on three prin- ciples established at the outset. The film explains the nature of gamma radiation relative to how time, distance, and shielding are used to provide protection from its harmful effects. Time is considered in two ways: (1) the half life of the radioactive materials used and (2) the speed in handling them. The film shows the continuous application of these principles from the moment radioactive materials are received at a hospital, through their storage, their preparation for use, their therapeutic administration, the nursing care of radioactive patients, and the disposal of radioactive human waste. The film details the special techniques and equipment used in the handling of radium and radioactive gold, iodine, and iridium as representing the variety of such materials that hospital personnel encounter and the consequent variations in time, distance, and shielding employed as protection against them. The use of monitoring devices and the maintenance of records of their readings form a recurrent theme throughout the film.