Accession Number : AD0676500

Title :   IDENTIFICATION AND MEASUREMENT OF ACTIVITY OF LONG-LIVED FRAGMENT BETA-ACTIVE ISOTOPES, INCLUDED IN THE COMPOSITION OF DISPERSED PHASE OF AEROSOLS (IDENTIFIKATSIYA I IZMERENIE AKTIVNOSTI DOLGOZHIVUSHCHIKH OSKOLOCHNYKH BETA-AKTIVNYKH IZOTOPOV, VKHODYASHCHIKH V SOSTAV DISPERSNOI FAZY AEROZOLEI),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Bolotin,V. F. ; Nemilov,N. F.

Report Date : 10 NOV 1967

Pagination or Media Count : 16

Abstract : The object of the study was to identify and measure the activity of nine long-lived beta-active fragment isotopes present simultaneously in the air of certain radiochemical plants: cesium-137, strontium-90, yttrium-90, ruthenium-106, rhodium-106, cerium-144, praseodymium-144, zirconium-95, and niobium-95 (all the isotopes except cesium-137 were present in pairs at equilibrium). The radiometric analysis of samples of aerosol particles on a filter involved the use of beta and gamma radiation spectra. A scintillation gamma spectrometer was used for Cs(137), Rh(106), Zr(95), Nb(95), and Ce(144), which emit an intense gamma radiation. A scintillation beta spectrometer was employed for isotopes which do not emit gamma quanta (Sr(90), Ru(106)) and isotopes having a small yield of gamma radiation per beta decay (Pr(144), Y(90)). The instrument employed is described, and the instrument spectra of the mixtures of isotopes are discussed.

Descriptors :   (*RADIOACTIVE ISOTOPES, *NUCLEAR RADIATION SPECTROMETERS), AEROSOLS, BETA PARTICLES, GAMMA RAYS, GAMMA COUNTERS, SCINTILLATION COUNTERS, GAS FILTERS, METALS, USSR

Subject Categories : Nuclear Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE