G - Physics – 01 – T
Patent
G - Physics
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T
358/5
G01T 1/20 (2006.01) G01T 1/167 (2006.01) G01T 1/178 (2006.01)
Patent
CA 1194244
RADIOMETRIC METHOD FOR DETERMINING CONCENTRATION OF NATURALLY OCCURRING ISOTOPES AND DEVICE THEREFOR Abstract of the Disclosure The proposed method essentially consists in that a sample of a substance is placed between two scintillators in immediate contact therewith whereupon said sample is hermetically sealed. Arranged in close proximitiy to each scintillator is a photomultiplier tube recording ionizing .alpha.- and .beta.-radiation. A selector is utilized to select pul- ses corresponding to .alpha.- and .beta.-particles, and delayed co- incidence circuits of a recording element separate and re- cord .beta.-.alpha. and .alpha.-.alpha. cascade pairs of delayed coincidences of RaC, ThC, and AcA radionuclides. Flows are measured twice at a predetermined time interval to account for ema- nation build-up tendency and concentration of isotopes of radium is determined from the formula Image , where Image = concentration of a given isotope of radium; .epsilon.A = isotope-of-radium concentration unit sensitivi- ty of measuring equipment; Image - number of pulses corresponding to cascade pairs for a given radionuclide measured immediately after sealing and after a preset time interval thereafter; .lambda.A= decay constant for radionuclide emanation; T = preset time interval equal to emanation build- -up time.
395882
Gerling Voldemar E.
Golubnichy Vladislav V.
Kotsen Marat E.
Stepanov Jury N.
Yakubovich Solomon L.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Vsesojuzny Nauchno-Issledovatelsky Institut Mineralnogo Syrya
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