Published 1976 | Version v1
Report Open

International comparison of the radioactivity of a 13 Ce solution (March 1976)

Creators

  • 1. Council for Scientific and Industrial Research, Pretoria (South Africa). National Physical Research Lab.

Description

The spurious pulses which are present when a 4π-liquid scintillation detector is used for the absolute measurement of the radioactivity concentration of a 13 Ce solution have been quantitatively estimated. When a single 9635 QB photomultiplier tube is used, the spurious-pulse contribution under conditions of maximum counting efficiency and minimum channel dead time can be as high as 10%. When two photomultipliers are used in coincidence for viewing the counting cell, the spurious-pulse contribution is diminished by a factor of 10. A correction of -1.3% to the final result, with an estimated uncertainty of about 0.2% has been determined for the 13 Ce measurements

Availability note (English)

MF available from INIS under the Report Number.

Abstract (Afrikaans)

'n Kwantitatiewe bepaling van die satellietimpulse wat voorkom wanneer 'n 4π-vloeistofsintillasiedetektor gebruik word vir die absolute meting van die radioaktiewe konsentrasie van 'n 13 Ce-oplossing is gemaak. Die bydrae van die satelliet-impulse onder kondisies van maksimum teldoeltreffendheid en minimum dooietyd kan so hoog as 10% wees wanneer 'n enkele 9635 QB-fotobuis gebruik word. Word twee fotobuise in koinsidensie gebruik om die sintillasies waar te neem, dan word die satelliet-impulsbydrae met 'n faktor 10 verminder. 'n Korreksie van -1.3% aan die finale resultaat met 'n geskatte onsekerheid van ongeveer 0.2% is vir die 13 Ce-metings bepaal

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The international comparison of radioactivity measurements on a solution of cesium-139

Additional details

Additional titles

Subtitle (English)
The effect of spurious pulses on the accuracy of the final result

Publishing Information

Imprint Pagination
21 p.
Report number
FIS--102

INIS

Country of Publication
South Africa
Country of Input or Organization
South Africa
INIS RN
8341111
Subject category
S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
Descriptors DEI
ACCURACY; CESIUM 139; COINCIDENCE METHODS; COUNTING TECHNIQUES; DEAD TIME; LIQUID SCINTILLATION DETECTORS; PHOTOMULTIPLIERS; PHOTOTUBES; PULSES; RADIOACTIVITY
Descriptors DEC
BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; INTERMEDIATE MASS NUCLEI; ISOTOPES; MEASURING INSTRUMENTS; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-EVEN NUCLEI; RADIATION DETECTORS; RADIOISOTOPES; SCINTILLATION COUNTERS; TIMING PROPERTIES

Optional Information