### MULTICOMPONENT RADIOMETRIC ANALYSIS OF ROCK SAMPLES USING THE LSU-5K ($sub 4$LAURA$sub 4$)-TYPE SCINTILLATION INSTRUMENTMULTICOMPONENT RADIOMETRIC ANALYSIS OF ROCK SAMPLES USING THE LSU-5K ($sub 4$LAURA$sub 4$)-TYPE SCINTILLATION INSTRUMENT

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 Author Yakubovich, A. L. ♦ Zaitsev, E. I. ♦ Anosov, V. V. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language Russian
 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) Educational Use Research Learning Resource Type Article Publisher Date 1963-09-01 Journal At. Energ. Volume Number 15