A simple positron lifetime system suitable for low density gases

P. G. Coleman, T. C. Griffith, G. R. Heyland, T. L. Killeen

Research output: Contribution to journalArticlepeer-review


A conventional positron lifetime system is described which gives data of high statistical accuracy and is especially suitable for gases at low density. Several factors contribute to the significant improvement in performance. The fraction of positrons annihilating in the gas is greatly enhanced by backscattering, and the small dimensions of the pressure vessel coupled with large plastic scintillators yields about 1200 coincidence events per second. Simple electronics are used with no side channel gating, and very clean spectra are obtained with overall resolution better than 1.5 nsec. The true start and stop pulses are counted, which enables the data to be treated by the authors' signal restoration method. The results of measurements in Ar-CO mixtures and data for H2 and D2 are presented and discussed.

Original languageEnglish (US)
Pages (from-to)271-273
Number of pages3
JournalApplied Physics
Issue number4
StatePublished - Apr 1974
Externally publishedYes


  • Positron annihilation
  • Positron lifetimes in gases

ASJC Scopus subject areas

  • General Engineering


Dive into the research topics of 'A simple positron lifetime system suitable for low density gases'. Together they form a unique fingerprint.

Cite this