Application of a Continuous Channel Electron Multiplier for Measuring Gaseous Tritium at Low Pressures

Some fundamental studies on the application of a continuous channel electron multiplier (channeltron) for monitoring gaseous tritium present in an evacuated vessel at low pressures below 10-4 Torr were carried out. The results showed that at the tritium pressures lower than 10-6 Torr the tritium cou...

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Bibliographic Details
Published in:RADIOISOTOPES 1980/07/15, Vol.29(7), pp.315-319
Main Authors: KAWABATA, Hironobu, YANAGI, Tadashi, SHINAGAWA, Mutsuaki
Format: Article
Language:eng ; jpn
Subjects:
channeltron
gaseous tritium
Gases
monitoring
Pressure
Radiation Monitoring - instrumentation
Tritium - analysis
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Summary:Some fundamental studies on the application of a continuous channel electron multiplier (channeltron) for monitoring gaseous tritium present in an evacuated vessel at low pressures below 10-4 Torr were carried out. The results showed that at the tritium pressures lower than 10-6 Torr the tritium counting rate measured by the channeltron increased linearly, in practice, with increasing tritium pressure, as was expected by assuming that the interactions between β-particle emitted from tritium and the vessel wall and gaseous molecules during the migration of β-particle to the channeltron can be ignored. However, in the range of pressures over 10-5 Torr the measured tritium counting rate was found to be getting smaller than the expected with increase in tritium pressure. This is presumably due to the absorption and scattering of β-particles by gaseous tritium.
ISSN:0033-8303
1884-4111
DOI:10.3769/radioisotopes.29.7_315