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2001 | 99 | 3-4 | 515-521
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Positron Irradiation Effects on Positronium Formation in Polycarbonate Sduring a Positron-Annihilation Experiment

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The positron-irradiation effect on polycarbonate during a positron-annihilation lifetime spectroscopy experiment was investigated using different intensities of ^{22}Na positron sources andγ-irradiated samples. The decrease in I_3 was larger for a larger intensity of positron sources. In the case of a weak source (≈ 140 kBq), I_3 did not change with the elapsed time for non-irradiated samples. However, for 1 MGy irradiated samples, I_3 measured with the weak source increased with the elapsed time. This can be attributed to a decrease in the radicals induced in the irradiated samples by γ-irradiation. In order to explain the change in I_3 measured at room and liquid-nitrogen temperatures, several effects, such as radicals, cross-linking, structure change, and charging, need to be considered. Also, it is difficult to explain the change in I_3 using only one of these effects.
  • High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
  • Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ami, Ibaraki 300-0394, Japan
  • Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-1106, Japan
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