2023 Fiscal Year Final Research Report
Fundamental study aiming for low-background radiation monitoring system excluding the effect of radon decay products
| Project/Area Number |
21K04561
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 25020:Safety engineering-related
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| Research Institution | Nagoya University |
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Principal Investigator |
KOJIMA Yasuaki 名古屋大学, アイソトープ総合センター, 准教授 (80314730)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 放射線計測 / リストデータ / 天然放射性核種 / ラドン壊変核種 |
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| Outline of Final Research Achievements |
The purpose of this studies is improvement of the lower limit of radiation monitoring system by eliminating the effect of natural radionuclides. Airborne aerosols collected on filter paper using an air sampler were used as the measurement samples, and the radiations emitted from them were measured with a PIPS and an NaI detector. Also, a software was developed to analyze the data stored in a list format with time stamp. The time-difference histograms of the detected events showed a characteristic time component with a half-life of about 168 microseconds. This corresponds to the half-life value of Po-214; It was confirmed that events caused by the decay of Po-214 can be extracted.
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| Free Research Field |
放射線計測
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| Academic Significance and Societal Importance of the Research Achievements |
放射線施設周辺の環境モニタリングを行う際に，放射線検出データを時間情報付きのリストデータ形式で保存する手法を適用することで，従来法よりも格段に自由度の高いデータ解析を可能にすることを目指したものである．従来の方法では捨てられていた検出時間情報を活用することで，伝統的な手法では得ることが困難な情報を引き出すことができ，実際，Bi-214 → Po-214 → Pb-210 の崩壊連鎖のイベントを抽出できること等を確認した．本データ収集法の放射線管理分野へのさらなる活用が期待できる．
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