Resonant ionization studies of the fluctuation of proportional counters

G. S. Hurst; S. L. Allman; M. G. Payne; K. A. Marshall; K. L. Soohoo

doi:10.1016/0029-554X(78)90205-7

Resonant ionization studies of the fluctuation of proportional counters

G. S. Hurst, S. L. Allman, M. G. Payne, K. A. Marshall, K. L. Soohoo

Emeriti, Retired, & In Memoriam (COSM)

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

A new technique is reported for the study of gas amplification fluctuation in proportional counters. Use was made of pulsed laser beams to carry out two-step resonant ionization spectroscopy (RIS) of Cs atoms which were seeded at very low concentration into the counting gas. With this independent determination of the fluctuation of the gas amplification, one can determine the Fano factor which enters into the statistics of the ionization of gases by swift charged particles. Accordingly, RIS measurements were made in P-10 gas (90% Ar+10% CH₄), and the fluctuations in pulse heights were compared with fluctuations observed with X-ray sources to obtain Fano factors. We found, for photoelectrons at 2.6 keV and at 5.9 keV stopping in the counting gas, the Fano factors 0.31±0.10 and 0.21±0.10 respectively.

Original language	English
Pages (from-to)	203-209
Number of pages	7
Journal	Nuclear instruments and methods
Volume	155
Issue number	1-2
DOIs	https://doi.org/10.1016/0029-554X(78)90205-7
State	Published - Sep 15 1978

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title = "Resonant ionization studies of the fluctuation of proportional counters",

abstract = "A new technique is reported for the study of gas amplification fluctuation in proportional counters. Use was made of pulsed laser beams to carry out two-step resonant ionization spectroscopy (RIS) of Cs atoms which were seeded at very low concentration into the counting gas. With this independent determination of the fluctuation of the gas amplification, one can determine the Fano factor which enters into the statistics of the ionization of gases by swift charged particles. Accordingly, RIS measurements were made in P-10 gas (90% Ar+10% CH4), and the fluctuations in pulse heights were compared with fluctuations observed with X-ray sources to obtain Fano factors. We found, for photoelectrons at 2.6 keV and at 5.9 keV stopping in the counting gas, the Fano factors 0.31±0.10 and 0.21±0.10 respectively.",

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AU - Hurst, G. S.

AU - Allman, S. L.

AU - Payne, M. G.

AU - Marshall, K. A.

AU - Soohoo, K. L.

PY - 1978/9/15

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N2 - A new technique is reported for the study of gas amplification fluctuation in proportional counters. Use was made of pulsed laser beams to carry out two-step resonant ionization spectroscopy (RIS) of Cs atoms which were seeded at very low concentration into the counting gas. With this independent determination of the fluctuation of the gas amplification, one can determine the Fano factor which enters into the statistics of the ionization of gases by swift charged particles. Accordingly, RIS measurements were made in P-10 gas (90% Ar+10% CH4), and the fluctuations in pulse heights were compared with fluctuations observed with X-ray sources to obtain Fano factors. We found, for photoelectrons at 2.6 keV and at 5.9 keV stopping in the counting gas, the Fano factors 0.31±0.10 and 0.21±0.10 respectively.

AB - A new technique is reported for the study of gas amplification fluctuation in proportional counters. Use was made of pulsed laser beams to carry out two-step resonant ionization spectroscopy (RIS) of Cs atoms which were seeded at very low concentration into the counting gas. With this independent determination of the fluctuation of the gas amplification, one can determine the Fano factor which enters into the statistics of the ionization of gases by swift charged particles. Accordingly, RIS measurements were made in P-10 gas (90% Ar+10% CH4), and the fluctuations in pulse heights were compared with fluctuations observed with X-ray sources to obtain Fano factors. We found, for photoelectrons at 2.6 keV and at 5.9 keV stopping in the counting gas, the Fano factors 0.31±0.10 and 0.21±0.10 respectively.

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Resonant ionization studies of the fluctuation of proportional counters

Abstract

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