首页|Attenuation correction for C-14 quantification by bremsstrahlung measurement with a germanium detector

Attenuation correction for C-14 quantification by bremsstrahlung measurement with a germanium detector

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Bremsstrahlung, generated when beta rays from carbon-14 interact with materials, offers a non-invasive method for radioactivity measurement in plants. However, because low-energy bremsstrahlung is attenuated by absorbers, attenuation correction is required. This study proposed an attenuation correction method that estimates absorber thickness by analyzing the count ratio in low- and high-energy regions of the spectra. Simulations and experiments were conducted using a germanium detector and soda-lime glass plates as absorbers. Experimental data revealed low-energy background components not observed in simulations, which were successfully estimated and subtracted using a Gaussian approximation. After background subtraction, experimental results aligned well with simulation data, demonstrating a linear relationship between the count ratio and absorber thickness. After applying the attenuation correction, the radioactivity became nearly constant for all glass thicknesses. This approach provides a foundation for non-invasive carbon-14 quantification and has potential applications in radiotracer studies on photosynthetic products in plants.

M. Tsuda、T. Moro、M. Yamaguchi、F. Sato、Y. Nagao、T. Yabe、Y.-G. Yin、Y. Miyoshi、N. Suzui、K. Enomoto、J. Furukawa、T. Kamiya、H. Sakurai、N. Kawachi、H. Watabe

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Graduate School of Biomedical Engineering,Tohoku University,Sendai,Miyagi 980-8579,Japan||Takasaki Institute for Advanced Quantum Science,National Institutes for Quantum Science and Technology(QST),Takasaki,Gunma 370-1292,Japan

Graduate School of Science and Technology,Gunma University,Kiryu,Gunma 376-8515,Japan

Takasaki Institute for Advanced Quantum Science,National Institutes for Quantum Science and Technology(QST),Takasaki,Gunma 370-1292,Japan||Graduate School of Science and Technology,Gunma University,Kiryu,Gunma 376-8515,Japan

Takasaki Institute for Advanced Quantum Science,National Institutes for Quantum Science and Technology(QST),Takasaki,Gunma 370-1292,Japan

Institute of Life and Environmental Sciences,University of Tsukuba,Tsukuba,Ibaraki 305-8577,Japan||Center for Research in Radiation,Isotopes,and Earth System Sciences,University of Tsukuba,Tsukuba,Ibaraki 305-8572,Japan

Graduate School of Biomedical Engineering,Tohoku University,Sendai,Miyagi 980-8579,Japan||Graduate School of Engineering,Tohoku University,Sendai,Miyagi 980-8579,Japan||Research Center for Accelerator and Radioisotope Science,Tohoku University,Sendai,Miyagi 980-8578,Japan

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2025

10.35848/1347-4065/add5b0

Japanese Journal of Applied Physics

Japanese Journal of Applied Physics

ISSN：0021-4922
年,卷(期)：2025.64(5)
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