|Author||Yakubovich, A. L. ♦ Zaitsev, E. I. ♦ Anosov, V. V.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||CHEMISTRY ♦ ACTIVATION ♦ BETA DETECTION ♦ BETA PARTICLES ♦ DEPOSITS ♦ EMISSION ♦ EQUATIONS ♦ GAMMA DETECTION ♦ GAMMA RADIATION ♦ INSTRUMENTS ♦ LEAD ♦ LEAD 212 ♦ LEAD 214 ♦ POTASSIUM ♦ POTASSIUM 40 ♦ PROSPECTING ♦ QUANTITATIVE ANALYSIS ♦ RADIUM ♦ RECORDING SYSTEMS ♦ SCINTILLATION COUNTERS ♦ SHIELDING ♦ SODIUM IODIDES ♦ STILBENE ♦ THALLIUM ♦ THORIUM ♦ URANIUM|
|Abstract||The individual determination of U, Ra, Th, and K in mineral deposits containing radioactive elements is of considerable importance in prospecting. For this reason, a four-component analysis of slightly radioactive specimens was developed including the separate determination of these elements. The presence of BETA - and gamma -emitting K/sup 40/ complicates the analysis of U, Ra, and Th; therefore the radioactivity parameters must be determined with great accuracy. For U, gamma measurements in the 95- to 110-kev range were used; while for Ra and Th, the best separation coefficients were obtained by differential gamma measurements at 240 and 350 kev. The 240-kev Pb/sup 212/ gamma line was found useful in the absence of large amounts of Ra. The photopeaks of 340 and 350 kev of Pb/sup 214/ made it possible to measure the Ra, as the count rate of Th was much lower. The K could be determined by differential gamma measurements of the 1.45-Mev photopeak of K/sup 40/ or by BETA measurements. The analysis is carried out by solving 4 equations. The instrument used for the measurements, designated as LSU-5K (Laura), allowed the simultaneous determination of the 4 parameters. It consisted of a combined BETA - gamma counter in a 70-mmm thick Pb shield and the required amplifying and recording system, A scintillation counter provided with NaI(Tl) crystal was used for gamma measurements; stilbene scintillators served for BETA counting. Placement of the instruments over each other made it possible to carry out the measurements simultaneously. (TTT)|
|Learning Resource Type||Article|
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