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Title: MINIMIZING SELF-ABSORPTION IN 4$pi$ /cap beta/-COUNTING

The incorporation of small Teflon particles into a solution of a weak BETA emitter, which is dried and 4 pi BETA -counted, was found to reduce self- absorption markedly. Sources of S/sup 35/, Pm/sup 147/, and Ni/sup 63/ were studied with and without the Teflon treatment. In the case of S/sup 35/, self- absorption can be reduced from 28 to 5.1 per cent if the mass of the source is about 0.5 mu g and 5 mu g of Teflon particles are added. Promethium-147 self- absorption can be reduced from 17 to 2.4 per cent for carrier masses of <1 mu g, and if as much as 10 mu g of carrier is present Pm/sup 147/ selfabsorption can be reduced from 54 to 4.3 per cent. Nickel63 self-absorption was reduced from 76 to 41.5 per cent but the original value of the Ni/sup 63/ standard source was not known accurately. (auth)
Authors:
;
Publication Date:
OSTI Identifier:
4115389
Resource Type:
Journal Article
Resource Relation:
Journal Name: Intern. J. Appl. Radiation Isotopes; Journal Volume: Vol: 14; Other Information: Orig. Receipt Date: 31-DEC-64
Research Org:
New York Operations Office, New York
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
CHEMISTRY; ABSORPTION; BETA DECAY; BETA DETECTION; BETA PARTICLES; CARRIERS; COUNTERS; EFFICIENCY; EVAPORATION; FOUR-PI COUNTERS; GRAIN SIZE; HUMIDITY; MIXING; NICKEL 63; OPERATION; ORGANIC FLUORINE COMPOUNDS; PERFORMANCE; POLYMERS; POWDERS; PREPARATION; PROMETHIUM 147; QUANTITY RATIO; RADIATION SOURCES; RADIOCHEMISTRY; RADIOISOTOPES; SELF-ABSORPTION; STANDARDS; SULFUR 35; TABLES; TEFLON; TRACE AMOUNTS; USES; VARIATIONS; WATER