THE APPLICATION OF INTERNAL LIQUID SCINTILLATION COUNTING TO A 4$pi$$-$$beta$- $gamma$ COINCIDENCE METHOD FOR THE ABSOLUTE STANDARDISATION OF RADIOACTIVE NUCLIDES
Technical Report
·
OSTI ID:4286092
ardization of B-emitting isotopes is described. The source is dissolved in a liquld scintillator, and a NaI scintillation counter detects the gamma rays. In this way the advantages of both the 4 pi liquid scintillation counting method and the coincidence method are realized. The solution of a radioisotope in the liquid scintillator fully conforms to the coincidence method requirement that one of the counters should be equally sensitive to all parts of the source. However, since the gamma efficiency of the liquid scintillator is by no means insignificant and the BETA efficiency is always less than 100%, the effect of the gamma -ray contribution on the results of the determinations is discussed. Under appropriate conditions the determinations are experimentally shown to be insensitive to gamma -ray contributions in the B channel. The following radioisotopes have been standardized by the method under discussion: Co/sup 60/, Na/sup 22/, Na/sup 24/, I/sup 131/, and Au/sup 198/. For comparison, 4 pi B- gamma coincidenee measurements have also been made with dry sources of these nuclides in a conventional 4 pi proportional flow counter. Excellent agreement has been obtained. (auth)
- Research Organization:
- Council for Scientific and Industrial Research, Pretoria
- NSA Number:
- NSA-13-006863
- OSTI ID:
- 4286092
- Report Number(s):
- A/CONF.15/P/1104
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
BETA PARTICLES
COBALT 60
COINCIDENCE METHODS
DETECTION
EFFICIENCY
ERRORS
GAMMA RADIATION
GOLD 198
IODINE 131
LIQUIDS
MEASURED VALUES
PERFORMANCE
PHOSPHORS
PHYSICS AND MATHEMATICS
PROPORTIONAL COUNTERS
QUANTITATIVE ANALYSIS
RADIATION SOURCES
RADIOACTIVITY
RADIOISOTOPES
SCINTILLATION COUNTERS
SODIUM 22
SODIUM 24
SODIUM IODIDES
SOLIDS
SOLUTIONS
STANDARDS
USES
COBALT 60
COINCIDENCE METHODS
DETECTION
EFFICIENCY
ERRORS
GAMMA RADIATION
GOLD 198
IODINE 131
LIQUIDS
MEASURED VALUES
PERFORMANCE
PHOSPHORS
PHYSICS AND MATHEMATICS
PROPORTIONAL COUNTERS
QUANTITATIVE ANALYSIS
RADIATION SOURCES
RADIOACTIVITY
RADIOISOTOPES
SCINTILLATION COUNTERS
SODIUM 22
SODIUM 24
SODIUM IODIDES
SOLIDS
SOLUTIONS
STANDARDS
USES