• Title/Summary/Keyword: 방사성 제논

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Optimization of Acquisition Time of Beta-Gamma Coincidence Counting System for Radioxenon Measurement (방사성제논 탐지를 위한 베타-감마 동시 계측시스템의 측정시간 최적화)

  • Byun, Jong-In;Park, Hong-Mo;Choi, Hee-Yeoul;Song, Myeong-Han;Yun, Ju-Yong
    • Journal of Radiation Protection and Research
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    • v.40 no.3
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    • pp.181-186
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    • 2015

  • Measurement of xenon radioisotopes from nuclear fission is a key element for monitoring underground nuclear weapon tests. $^{131m}Xe$, $^{133}Xe$, $^{133}mXe$ and $^{135}Xe$ in the air can be detected via low background systems such as a beta-gamma coincidence counting system. Radioxenon monitoring is performed through air sampling, xenon extraction, measurement and spectrum analysis. The minimum detectable concentration of $^{135}Xe$ can be significantly variable depending on the sampling time, extraction time and data acquisition time due to its short half-life. In order to optimize the acquisition time with respect to certain experimental parameters such as sampling and xenon extraction, theoretical approach and experiment using SAUNA system were performed to determine the time to minimize the minimum detectable concentration, which the results were discussed.

  • https://doi.org/10.14407/jrp.2015.40.3.181 인용 PDF KSCI

Simulation Study on Atmospheric Emission Scenarios of Radioxenon Produced by the North Korea's 6th Nuclear Test (북한 6차 핵실험으로 생성된 방사성제논의 대기 중 방출 시나리오에 대한 모의실험 연구)

  • Park, Kihyun;Min, Byung-Il;Kim, Sora;Kim, Jiyoon;Suh, Kyung-Suk
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.18 no.2_spc
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    • pp.261-273
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    • 2020

  • North Korea conducted the sixth underground nuclear test on September 3, 2017 at the Punggye-ri Nuclear Test Site (NTS). In contrast to the previous five nuclear tests, several induced earthquakes occurred around the NTS after the sixth nuclear test and this may have caused radioxenon leakages at the site. Considering these reported earthquakes, we performed atmospheric dispersion simulations on some radioxenon emission scenarios for this event using our Lagrangian Atmospheric Dose Assessment System (LADAS) model by employing the Unified Model (UM) based numerical weather prediction data produced by the Korea Meteorological Administration (KMA). To find out possible detection locations and times, we combined not only daily and weekly based delayed releases but also leakages after the reported earthquakes around the NTS to create emission scenarios. Our simulation results were generally in good agreement with the measured data of the Nuclear Safety and Security Commission and International Monitoring System (IMS) stations operated by the Comprehensive nuclear Test-Ban-Treaty Organization (CTBTO).

  • https://doi.org/10.7733/jnfcwt.2020.18.2(E).261 인용 PDF KSCI

Factors Affecting the Minimum Detectable Activity of Radioactive Noble Gases (방사성 노블가스 측정을 위한 최소검출방사능 산출의 조절인자)

  • Park, Ji-young;Ko, Young Gun;Kim, Hyuncheol;Lim, Jong-Myoung;Lee, Wanno
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.16 no.3
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    • pp.301-308
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    • 2018

  • Anthropogenic radioactive noble gases formed by nuclear fission are significant indicators used to monitor the nuclear activity of neighboring countries. In particular, radioactive xenon, owing to its abundant generation and short half-life, can be used to detect nuclear testing, and radioactive krypton has been used as a tracer to monitor the reprocessing of nuclear fuels. Released radioactive noble gases are in the atmosphere at infinitesimal amounts due to their dilution in the air and their short half-life decay. Therefore, to obtain reliable and significant data when performing measurement of noble gases in the atmosphere, the minimum detectable activity (MDA) for noble gases should be defined as low as possible. In this study, the MDA values for radioactive xenon and krypton were theoretically obtained based on the BfS-IAR system by collecting both noble gases simultaneously. In addition, various MDA methods, confidence level and analysis conditions were suggested to reduce and optimize MDA with an assessment of the factors affecting MDA. The current investigation indicated that maximizing the pretreatment efficiency and performance maintenance of the counter were the most important aspects for Xe. In the case of Kr, since sample activities are much higher than those of Xe, it is possible to change the target MDA or to simplification of the analysis system.

  • https://doi.org/10.7733/jnfcwt.2018.16.3.301 인용 PDF KSCI

대기 중 노블가스 분석

  • Lee, Wan-Ro;Lee, Seung-Il;Choe, Sang-Do;Jo, Yeong-Hyeon;Jeong, Geun-Ho;Kim, Hui-Ryeong;Lee, Chang-U;Choe, Geun-Sik;Gang, Mun-Ja;Jeon, In;Geum, Dong-Gwon
    • 대한방사선방어학회:학술대회논문집
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    • 2010.04a
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    • pp.168-169
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    • 2010

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