For dose rate monitoring in high level radiation fields, we have proposed a concept of novel dose rate monitoring method based on high sensitive laser absorption spectroscopy technique for radiation induced chemical species. The yield of the species depends on the intensity of the radiation field. The dose rate of the radiation field, therefore, can be derived from concentrations of the species. We have adopted cavity ring-down spectroscopy, which is an ultra high sensitive laser absorption spectroscopy, to measure trace quantities of radiation induced chemical species. We have tried proof-of-principle experiments through the off-line/on-line measurement of 60Co gamma-ray induced NO2 in the air. From these results, it has been verified that the present cavity ring-down measurement is quite useful as a dose rate monitoring method for intense radiation fields with high radiation resistance, where the expected performance will be the detectable range of the absorbed dose rate is from 0.5 to 2 × 103 Gy(air)/s with the time resolution of about 30 s.
|ジャーナル||IEEE Nuclear Science Symposium Conference Record|
|出版ステータス||出版済み - 2004|
|イベント||2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors - Rome, イタリア|
継続期間: 10 16 2004 → 10 22 2004
All Science Journal Classification (ASJC) codes