貯水池における太陽紫外線量評価

概要

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Thermoluminescence phosphors available for the estimation of ultraviole (UV) irradiation dose are examined. A several kind of lanthanide elements are doped in pure CaF_2 powder crystals and properties of the TL to UV radiation are observed. It is found that the TL intensity from the sintered CaF_2 doped with Tb_4O_7 is the highest among the samples doped other lanthanide elements. And It is also found that the TL peak intensity of CaF_2 : Tb become strong by addition of Sm_2O_3 and Gd_2O_3. The 146℃ peak intensity of CaF_2 : Tb,Sm,Gd increases with the UV irradiation dose, and the 146℃ peak may also be suitable for use as a dosimeter. In the present study, the seasonal change in the amount of sunlight UV at the reservoir was measured with the sintered CaF_2 : Tb,Sm,Gd phosphor.