Document 6RzBE3kkaYjZpO52w4q21QKo3

Industrial Hygiene Digest Augmt. confirmed but negative data were not tested, Tho death record* of the Pennsylvania Slat* Department of Health were also searched, a* were the leukemia record* from 1954 to No cases of malignant disease were found la the treated group, although 4 eases.of csnjg-^ including one of leukemia would be expected to occur in a group of children of this sin; ago distribution. The d malignent tumors in the sibling group, including one case of Uuktt,.jt compared closely with the expected number. -- Nuclear Scl, Abu, -oj u*.to;:iM>n amt Etfucts of Radioactive Particulates In the Lung, C, W# LaBelle, st si, >":r. <*. *tygT~Ajsn. J. 1952QO (June-19bO)^_ A 5-mlcrogram dose of uranium dioxide particles placed In the lungs of rt eliminated in 2 stages. During the first stage, about one-third of the material Is V( t* within the first day or two (half-life 17 hours) while the remainder Is eliminated much f. lowly, with a half-Ufe of 71 days, so that small but measurable amounts can still )> -t. covered during the second year. With a specific activity of 10,000 dpm in 5 micrn^rxma . material, the integrated radiation exposure to the lung during the first year is slnvist i .equal to the accepted tolerance dose of 15 rep per year. No signs of radiological damac,. 4.. bo detected in any of the animals exposed to this dose, either during the year in which th.- , x. posurs occurred or during the following year, whon the effective oxposure was for ali pru.<; , purposes negligible. This confirms the accepted view that a dose of IS rep within one .. without effect, since the observation period, though extending only to a total of 2 yean ,t nearly equal to the life span of the animals* It is worth noting, however, that the smo.u.: radioactive materiel required to yield this tolerance level i* rather greater than is impitv: by the maximum permissible intake tables of Morgan, Snyder and Ford. In other words, Morgan tables ere conservative. There Is evidence to suggest that at least some inaoVou- particulates are cleared from the lungs slowly, with half-lives up to 6 months, in such , i., the figures in the Morgan tables would be too high. This does not imply that the Mur^r. ,, are not valuable, but only that they need to be used with due allowance for known deparurv* from their premises. Cond, from author's conclusion. 795 Information and Education for Industrial Use of Radioisotopes. P. J. Blaetus, TlD-75?i, (pp. 262-266). Office of Isotopes Development. Isotope Technology Branch, AC. 5 pp. Significant publications and services are outlined which are available to anyone interested in acquiring an introduction to the literature of nuclear energy as awhoie and applications of radioisotopes in industrial research and development in particular. -- Nuclear Sci. Abt. 79b Radioisotopes and the Law. S, D. Estep. T1D-7571. (pp. 75-91). University of Law School. Ann Arbor. 17 pp. The use of radioisotopes can result in great benefits for mankind, both as to hoslth and economics. However, the use of such materials presents significant health anr safety risks to the user and perhaps to many other#. In most cases the v.try chare* which makes radioisotopes.-UAique end therefore so useful makes them dangerous. The <L? gurs are sufficient to have caused government agencies to Impose regulation*; upon th*>r A survey is presented for the business executive and engineer of the posaiblc legal ecu#*- of making use of radioisotopes. Not all uf those consequences arise from the health a<l problems but those of greatest significance do and attention is directed primarily t<> th*# 1 The responsibility of the lawyer is to identify for the user the potential. liabiU*.ie i:r. using such material. -- Nucsear Scl. Abri*. i ( j i f J c j< .; 24 l 4 .< > :; 'A...