Average Energies Required per Scintillation Photon and Energy Resolutions in NaI(Tl) and CsI(Tl) Crystals for Gamma Rays
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概要
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The average energies required to produce one scintillation photon $W_{\text{s}}$ were determined for 662 keV gamma rays in NaI(Tl) and CsI(Tl) crystals to be $15.0\pm 1.3$ and $13.3\pm 1.1$ eV, respectively, from the absolute numbers of photoelectrons measured for several combinations of a crystal and a photomultiplier tube (PMT) used as a vacuum photodiode. The numbers of scintillation photons were obtained by calculating the collection efficiency of scintillation photons at the photocathode using Monte Carlo simulations and by determining experimentally the photon-to-photoelectron conversion efficiency at PMT photocathode. The values of $W_{\text{s}}$ determined in the present study are in good agreement with the theoretical values presented recently. The factors affecting energy resolutions were also examined. The calculated resolution agrees well with that obtained experimentally.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2006-08-15
著者
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TAWARA Hiroko
High Energy Accelerator Research Organization
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SASAKI Shinichi
High Energy Accelerator Research Organization
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SAITO Kiwamu
High Energy Accelerator Research Organization
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Shibamura Eido
Saita Prefectural University, 820 Sannomiya, Koshigaya, Saitama 343-8250, Japan
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Miyajima Mitsuhiro
Waseda University, 4-1 Okubo 3-chome, Shinjuku-ku, Tokyo 169-8555, Japan
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Tawara Hiroko
High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
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