Control of Radiation Hazards in Uranium Mining (FRC Report

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J. ILwrtatiou *ubmittccl to (;raduatc (partial fulfillmcwt rrquirt~mcwt for degree of Dwtor of Sirienw). l. ’ Altmann. II. U . irk, I~:pithelial (:art*inonia in Rat \natomic. untl zur :Illgemrinrn Cdo. Studies VI. U. Pitt*burgh to S-ray*. Syndrome Pathologic Univ. in Heagle* l*Yfects of Inhaled R.. and Stutz. I*:. The llistogtwc& of Radiation-Induced Squamous (:hange~ in J~rond~ial 1:pithelium. Rritrage zur Pathologiachen Pathologir. Vol. 5, p. 403. 1961. III~~ ” (Gate*. (1.. arren. S. lliatogeneai~ parch.

1) contribute only indirectly to the risk of lung cancer, but the point is not absolutely established. 2. The immediately relevant nuclides start withpolonium 218 and terminate with polonium 214; the intervening short-lived nuclides come into radioactive equilibrium with the parent radon 222 in about 3 hours. The formation of lead 210, withits 22-year half-life, then effectively blocks the series; its formation in the respiratory system is inconsequential. Bismuth 214 has an alternative mode of disintegration by alpha emission to thallium 210, whichthen decays by beta emission to lead 210; however, the fraction of the disintegrations following this mode is too small to be of consequencein the present analysis.

P. 33. Jan. 1965. and Millerr-. llealth 52 Pirchan. p. 1681, 1932. :\.. and Sikl, 11. ung in bliners Cells in Sputunl. of Joarhimsthal. sJ l*:vann. 11. D.. and (;ooclman, C. Determination of Thoron Lung (:ancer llazarcls in Industry. J. lndustr. llyg. ant1 Toxicology, 5( Mitchell. J. S. hIcmorandum lteferenre to Tolerance Problems. ss Peller. S. ung (:anrer Arta :\mcr. Mine Workers Cytologira. J. Cancer, Vol. 16. Content of Air and its Bearing \ol. 22. p. 89, 1940. in Joachimatl~al. Iluman Biology.

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