• Title/Summary/Keyword: radioactive ray

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Effectsof absorbed radioactive sulfur $S^35$ in plant cell. II. Effects of sulfur on the growth and tissue respiration of rye seedlings (식물에 미치는 방사성 동위원소 $S^35$의 영향에 대하여 (제2보) 발아호밀의 생장 및 조섬호흡에 미치는 영향)

  • 홍순우
    • Journal of Plant Biology
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    • v.8 no.1_2
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    • pp.5-10
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    • 1965

  • The effect of radioactive sulfur-35 on the growth and tissue respiration in rye, Secale cereale L., seedlings were studied in this investigation. The growth and respiration rate of the materials treated with the different intensities of radioactivity, represented by the different concentration(${\mu}c$) of radioactive sulfur were shown similar effects in treated groups as those of Gamma-ray or X-ray irradiation on plant materials. However, in the groups of ($0.1{\mu}c$ and ($0.4{\mu}c$ S35-solution, the growth and respiration rate were stimulated somewhat more clearly than in case of control. And the higher concentration groups, $1.6{\mu}c$, $6.4{\mu}c$, and $25.6{\mu}c$ were depressed of the growth and tissue respiration rate. The present data could be explained on the basis that the higher concentration treatments with the radioactive isotope did produce injury to the plant metabolism generally, but the moderate treatment would stimulate to the plant growth and tissue respiration.

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Determination of X-ray and gamma-ray shielding capabilities of recycled glass derived from deteriorated silica gel

  • P. Sopapan;O. Jaiboon;R. Laopaiboon;C. Yenchai;C. Sriwunkum;S. Issarapanacheewin;T. Akharawutchayanon;K. Yubonmhat
    • Nuclear Engineering and Technology
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    • v.55 no.9
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    • pp.3441-3449
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    • 2023

  • We determined the radiation shielding properties for 10CaO-xPbO-(90-x) deteriorated silica gel (DSG) glass system (x = 20, 25, 30, 35, 40, and 45 mol.%). The mass attenuation coefficient (MAC) has been estimated at photon energies of 74.23, 97.12, 122, 662, 1173, and 1332 keV using a narrow beam X-ray attenuation and transmission experiment, the XCOM program, and a PHITS simulation. The obtained MAC values were applied to estimate the half value layer (HVL), mean free path (MFP), effective atomic number, and effective electron density. Results show that the MAC value of the studied glasses ranges between 0.0549 and 1.4415 cm2/g, increases with the amount of PbO, and decreases with increasing photon energy. The HVL and MFP values decrease with increasing PbO content and increase with increasing photon energy. The recycled glass, with the addition of PbO content (20-45 mol.%), exhibited excellent radiation shielding capabilities compared to standard barite and ferrite concretes and some glass systems. Moreover, the experimental radiation shielding parameters agree with the XCOM and PHITS values. This study suggests that this new waste-recycled glass is an effective and cost-saving candidate for X-ray and gamma-ray shielding applications.

  • https://doi.org/10.1016/j.net.2023.06.014 인용 PDF

Comparison of theoretical and machine learning models to estimate gamma ray source positions using plastic scintillating optical fiber detector

  • Kim, Jinhong;Kim, Seunghyeon;Song, Siwon;Park, Jae Hyung;Kim, Jin Ho;Lim, Taeseob;Pyeon, Cheol Ho;Lee, Bongsoo
    • Nuclear Engineering and Technology
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    • v.53 no.10
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    • pp.3431-3437
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    • 2021

  • In this study, one-dimensional gamma ray source positions are estimated using a plastic scintillating optical fiber, two photon counters and via data processing with a machine learning algorithm. A nonlinear regression algorithm is used to construct a machine learning model for the position estimation of radioactive sources. The position estimation results of radioactive sources using machine learning are compared with the theoretical position estimation results based on the same measured data. Various tests at the source positions are conducted to determine the improvement in the accuracy of source position estimation. In addition, an evaluation is performed to compare the change in accuracy when varying the number of training datasets. The proposed one-dimensional gamma ray source position estimation system with plastic scintillating fiber using machine learning algorithm can be used as radioactive leakage scanners at disposal sites.

  • https://doi.org/10.1016/j.net.2021.04.019 인용 PDF KSCI

Study in Background Reduction for the Neutron Induced Prompt Gamma-ray Spectroscopy

  • Song, Byoung-Chul;Jee, Kwang-Yong;Park, Yong-Joon
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2004.06a
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    • pp.433-433
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    • 2004

  • Neutron induced prompt gamma-ray spectroscopy (NIPS) system measures the prompt gamma-ray, emitting by the interaction of a neutron with various materials. This system will be of great benefit to scientists worldwide, since it provides the non-destructive measurement of many elements in either solid or liquid wastes. A NIPS facility has been developed in Nuclear Chemistry Research Division, at Korea Atomic Energy Research Institute (KAERI) with the aim of analyzing the major component elements in both aqueous and solid samples.(omitted)

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