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BIOLOGY AND MEDICINE 9 The technical film gives a brief historical development of the medical uses of cyclotrons and shows the unique properties of accelerator- produced heavy particles both in investigative studies and in radiation therapy. Experience at the Donner Laboratory shows that this new tool of nuclear medicine when used in pituitary irradiation provides creditable results in the treatment of acromegaly, Gushing's disease, and the retardation of diabetic retinitis. In addition, the Bragg effect of alpha particle radiation is of increasing importance in direct treatment of tumors of the brain and soft tissue. HUMAN RADIOACTIVITY MEASUREMENTS (1958). 9 minutes, color. Produced by USAEC's Los Alamos Scientific Laboratory. For sale by Byron Motion Pictures, at $29.36 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters, field libraries, and Los Alamos Scientific Laboratory, P. O. Box 1663, Los Alamos, New Mexico. Cleared for television. This film shows a method developed at Los Alamos Scientific Labora- tory to monitor personnel exposed to the possible intake of gamma- emitting materials and to study the retention and excretion of radio- active isotopes by the body. The liquid scintillation counter is large enough to contain a man and sensitive enough to detect even the minute amounts of his natural gamma radioactivity. IODINE-131 (1958). 15 minutes, color. Produced by the Jam Handy Organization, Detroit, for the USAEC. For sale by Byron Motion Pictures, at $55.56 per print, including shipping case, F.O.B. Washington, D. C. Avail- able for loan (free) from USAEC headquarters and field librar- ies. Cleared for television. This film shows the diagnostic and therapeutic uses of the radioisotope 131 I for hyper thy roidism, thyroid cancer, and heart disease. The char- acteristics, techniques, and results are discussed, as well as the problems of standardization and calibration of scanning devices for 131 I, which is probably the most used isotope in the field of medicine. IONIZING RADIATION IN HUMANS (1958). 15 minutes, color. Produced by USAEC's Argonne National Laboratory. For sale by Byron Motion Pictures, at $50.30 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters, field libraries, and Argonne National Laboratory, 9700 South C ass Ave., Argonne, 111. 60440. Cleared for television. This film shows the design and operation of Argonne National Labora- tory's whole-body counter for determining identification, quantity, and location of internally deposited radioelements. Various techniques in