ＰＭＭＡ線量計（Ｒａｄｉｘ　ＲＮ‐１５）の数ｋＧｙ領域への応用

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タイトル別名
  • Application of Clear Polymethylmethacrylate Dosimeter, Radix RN-15 to Several kGy Range
  • PMMA センリョウケイ Radix RN 15 ノ スウ kGy リョウイキ エノ オウヨウ

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抄録

Undyed and dyed polymethylmethacrylate dosimeters are widely used as routine dosimeters in radiation processing for the absorbed dose range 5-50 kGy, especially in the radiation sterilization of disposable medical products. Basic characteristics ofRadix RN15 ; a commercially available undyed polymethylmethacrylate dosimeter, was studied also in the dose range 1-10 kGy, for its wide application to radiation processing especially for the evaluation to decide sterilization dose and the quality assurance of food irradiation. The characteristics of dose response, the effect of irradiation temperature, and its stability after irradiation were examined at readout wavelength 270-320 nm. The dose response read-out at shorter wavelength is higher than that at longer wavelength. The measurable dose range of 1-10kGy is obtained at the readout wavelength of 280 nm that is shorter than conventional read-out wavelength of 320 nm. The postirradiation stability of dose response for 6 kGy is less than 4-5% for longer than 24h after irradiation. The dose response slope at 6 kGy while held at irradiation temperatures in the range -40-40°C, increases with temperature up to 20°C as the maximum, and decreases at higher temperatures. Radix RN15 has linear temperature dependence with a coefficient of +0.25%/°C, relative to the dose response at under 20°C, at irradiation temperature in the range -40-20°C.

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