Andrew F. Stehney

A study of radioactivity and health status of former thorium workers: preliminary report.

Studies have been started of the late effects of thorium on the health of a population of 4316 persons (80% males) who worked at a thorium refinery during the period from the mid-1930s to 1973. The population and the study are described briefly, as are the methods and results to date of measurements of radioactivity in vivo and in the exhaled breath. Of 46 men examined so far, all but three had readily measurable amounts of thoron in the breath, but there was little correlation between the amount of activity in the breath and the /sup 212/Bi content of the chest.

Cross section for 7Be production from 12C with protons of 3 – 12.5 GeV

Abstract Determinations of σ C ( 7 Be ) were made at seven proton bombarding energies between 3 and 12.5 GeV. The excitation function in this energy range is nearly constant with a slight downward trend from about 9.6 ± 0.8 mb at 3 GeV to 9.2 ± 0.8 mb at 12.5 GeV.

Secondary nuclear reactions of 11.5 GeV protons on uranium: A search for the production of transcurium actinide elements

Abstract A search was made for transcurium actinide elements produced by bombardment of uranium with 11.5 GeV protons. Such products might be formed if fragments of Z > 4 are emitted in the primary interaction with sufficient energy to induce secondary reactions of the heavy-ion type in nearby nuclei in the target matrix. Of particular interest is the possibility of forming products of high neutron-to-proton ratio not easily produced with the stable species presently available as projectiles in heavy-ion accelerators. The feasibility of such studies was examined by searching for known and easily identifiable products, utilizing neutron, γ -ray, α -particle and spontaneous-fission counting techniques. Upper limits to the production cross section of 254 Fm and 256 Fm were set at 1.8 × 10 −8 and 3.6 × 10 −10 b, respectively.

Interchange of Fission‐Product Bromine with Carrier Bromine

Experiments on the interchange of the fission products 2.4‐hr Br83 and 55.6‐sec Br87 with carrier bromine have been performed. Essentially the same degree of interchange is effected by the following chemical procedures: carrier added as BrO3− and reduced by H2S, carrier added as BrO3− and reduced by excess carrier Br−, and carrier added as Br− to HCl and irradiated uranium metal dissolved.