Induced radionuclides in astronauts Final report, 15 Jun. 1967 - 1 Sep. 1968

Experimental determination of cosmic radiation effects on tissue equivalent materials and human

Cosmic ray induced radioactivity in astronauts as a measure of radiation dose /a/

Cosmic ray induced radioactivity in astronauts as measure of radiation dosag

Evaluation of an in-situ x-ray fluorescence analyzer for inorganic pollutants in sediments and water columns

The applicability of an energy dispersive x-ray fluorescence spectrometer for measurement of trace elements in sediments and in water columns from Coast Guard vessels has been investigated. This investigation was conducted in both freshwater and saltwater areas and included Puget Sound, Lake Washington, Lake Union, and the ship canal in the State of Washington. The spectrometer system consisted of a solid cryogen-cooled Si(Li) detector and a /sup 109/Cd excitation source. Sediments and water columns were viewed through a 0.2 mm Be window. This study showed the feasibility of measuring trace elements at concentrations ranging from 20 to about 100 ppM. Measurements of this sensitivity with a 100 mCi /sup 109/Cd source are possible for time intervals as short as 5 minutes. This in-situ measurement capability permits the on-site mapping of pollution and avoids the problem of sediment disturbance which is inherent in the collection of grab samples of the sediment surface. Recommendations for an improved analyzer system included a detector assembly which could be towed, or allow continuous sediment surface analysis thereby recording the average composition of a large area

Comparison of Ge(Li) and anti-Compton systems for measurements of environmental samples

There are numerous reasons for performing environmental measurements for routine health or safety monitoring and to determine the movement of trace elements or radionuclides through our environment to man. This is often a requirement for the licensing of nuclear power reactors, as well as many other meteorological or environmental research experiments. In this paper a variety of sensitive low-level counting systems are discussed from an analyst's viewpoint, centering on a variety of Nal(Tl) and Ge(Li) gamma ray spectrometers. The coincident gamma-ray emitters are most sensitively detected through NaI(Tl) multidimensional gamma ray spectrometry, while single gamma ray emitters are very sensitively detected with Ge(Li) detector systems. NaI(Tl) detector systems are superior in general for environmental measurements. (auth

CHARGE AND MASS DISTRIBUTION STUDIES IN THE FISSION OF NEPTUNIUM-237 AND PLUTONIUM-239 BY INTERMEDIATE ENERGY HELIUM IONS

Abstract not availabl