Research About Biodegradability Scintillator

• Project/Area Number: 26820413
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear engineering
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: Ohnishi Seiki 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (60392693)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 放射線計測 / シンチレータ / シンチレーター / 放射線

Outline of Final Research Achievements

At first, saturated solutions of the water-soluble fluorescent materials were made and their characteristics were measured with a fluorescence analyzer. Since most of the samples showed significant fluorescence, then gamma-ray irradiations were conducted and pulse height distributions from them were measured. While fluorescence was observed in the case where the sample was excited by visible or ultraviolet light, no significant signal was measured during the gamma-ray irradiation. This implies that the energy transfer from gamma-ray is not sufficient, therefore, mixed solution which contains materials of which solubility is large and of which fluorescence is strong were prepared and tested. However, the pulse height distribution was not changed, and it is possible that the water around the fluorescent molecules inhibit the energy transfer. A medium which can transfer the energy of gamma-ray smoothly between molecules is important to improve the scintillation efficiency.