![]() Complete measurements were made of tooth and bone MsTh/Ra ratios on 24 individuals. An extensive intercomparison of Ra burden measurements on living subjects was carried out between more » M.I.T. In all cases possible gamma ray measurements were made of Ra and MsTh decay products retained in the body, alpha -ray measurements of Rn and Rn/sup 220/ in breath, a complete medical history was taken, a complete x-ray examination was made of the skeleton, and urinalysis, hematological, and blood chemistry studies were made. Physical and clinical studies were made on 151 persons. Several Thorotrast cases were also examined. The study of the toxicity of Ra and MsTh(Ra/sup 228/) in humans was continued. (For preceding period see AECU-4422.) (C.H.) « less Progress is reported in the development of fast neutron dosimeters. Methods of physical dosimetry are discussed. Data are tabulated on the radium and mesothorium burdens of subjects and pathological conditions in individuals exposed to radioactive materials with particular reference to radium content. Data on patients exposed to radioactive materials are being put on punched cards for a central catalog of cases. Over 800 cases of expcsure to radium, mesothorium, or their decay products have been located on which some details are available. Over 200 persons with occupational or therapeutic exposure to radioactive materials more » were located. Semiquantitative radium burden estimates were made on 32 individuals by means of breath samples. ![]() ![]() Assays of whole-body gamma emission due to radium burdens were made in the controlled background facility. The study of radium and mesothorium toxicity in human beings was continued, with emphasis on living persons as distinct from persons no longer living whose dosimetry is reconstructed from bone or tooth samples. The result is in substantial agreement with the half-periods already reported in the literature. The half-period of thorium-232 was redetermined as 1.41 x 10/sup 10/ years.
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