• Title, Summary, Keyword: 삼중수소

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Tritium Concentrations in Surface Seawater around Korean Peninsula (한국 주변 해역 표층해수중 삼중수소 농도)

  • Kim, Chang-Kyu;Cho, Yong-Woo;Kim, Kye-Hun
    • Journal of Radiation Protection and Research
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    • v.21 no.2
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    • pp.107-115
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    • 1996
  • An electrolytic enrichment technique was used to measure low levels of tritium in seawater around the Korean peninsula. Tritium concentrations were determined for surface seawater samples collected from the East Sea, the South Sea, and the Yellow Sea. The tritium concentrations in surface seawater samples from the study area ranged from $0.12 BqL^{-1}\;to\;1.50BqL^{-1}$ with a mean value of $0.60{\pm}0.35 BqL^{-1}$. The means of the tritium concentration were $0.54{\pm}0.30 BqL^{-1}$ for the East Sea, $0.48{\pm}0.35 BqL^{-1}$ for the South Sea, and $0.77{\pm}0.32 BqL^{-1}$ for the Yellow Sea. The tritium concentrations in the sea areas did not show much difference no matter where the samples were taken. Due to the limited number and distribution of sampling points, no systematic change in tritium levels with latitude was observed. Measured tritium levels were similar to those observed in other data collected near Japan, but higher than mid-Pacific Ocean measurements.

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Evaluation Model and Experimental Validation of Tritium in Agricultural Plant (농작물의 삼중수소 오염평가 모델 개발 및 실험검증)

  • Kang Hee Suk;Keum Dong-kwon;Lee Hansoo;In Jun;Choi Yong Ho;Lee Chang Woo
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.3 no.4
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    • pp.319-328
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    • 2005
  • This paper describes a compartment dynamic model for evaluating the contamination level of kritium in agricultural plants exposed by accidentally released tritium. The present model uses a time-dependent growth equation of plant so that it can predict the effect of growth stage of plant during the exposure time. The model including atmosphere, soil and plant compartments is described by a set of nonlinear ordinary differential equations, and is able to predict time-dependent concentrations of tritium in the compartments. To validate the model, a series of exposure experiments of HTO vapor on Chinese cabbage and radish was carried out at the different growth stage of each plant. At the end of exposure, the tissue free water(TFWT) and the organically bound tritium(OBT) were measured. The measured concentrations were agreed well with model predictions.

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An Assessment on the Contribution of $^3$He to the Tritium Generation in the CANDU PHWR (가압중수로에서 헬륨-3이 삼중수소의 생성에 미치는 영향평가)

  • Kwak, Sung-Woo;Chung, Bum-Jin
    • Journal of Radiation Protection and Research
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    • v.22 no.2
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    • pp.119-125
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    • 1997
  • PHWR achieves high neutron economy by adopting heavy water as its moderator and coolant. On the other hand it permits much tritium generation, compared to LWR, due to the neutron capture reaction of deuterium in heavy water. Meanwhile in the reactor core, $^3He formed as the result of-decay of tritium, captures a thermal neutron and transforms to tritium again. The existing calculation models on tritium generation in PHWR neglect the contribution of $^3He$ in both moderator and coolant due to its relatively low solubility. However the neutron capture cross-section of $^3He$ is almost $1.6{\times}10^7$ times as large as that of deuterium. That means that the dissolved amount of 0.03 ppm of $^3He$ in heavy water is enough to generate the same amount of tritium as that generated by the deuterium of total heavy water in the system. This study dealt with the contribution of $^3He$ to tritium generation. As a sample case, the contribution of $^3He$ to the tritium generation in Wolsong #1 was evaluated and compared to the measured values. According to the result of this study, it is concluded that $^3He$ in coolant contributes very much to the tritium generation but that in moderator shows negligible effects due to the low solubility and $^4He$ cover gas. At the beginning of the plant operation, the contribution of $^3He$ is slightly greater than the measured value but agrees well with the measured as the operating time increases.

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삼중수소 활용: 자발광유리관 (SLGT) 제조기술

  • 김경숙;김광신;정은수;손순환
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • pp.239-240
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    • 2004
  • 작년 2월에 착공식을 가진 월성의 WTRF (Wolsung Tritium Removal Facility)에서 2005년 후반기부터 매년 $2.6{\times}10^{16}$ Bq(7 MCi) 이상의 삼중수소가 생산될 예정이므로 이제 우리나라에서도 삼중수소를 활용하는 연구를 본격적으로 할 수 있게 되었다. 현재 우리나라는 삼중수소를 전량, 수입하여 37 MBq (1 mCi) 혹은 $3.7{\times}10^{10}$ Bq (1 Ci)미만의 매우 적은 양으로 생물, 생화학, 농학 및 의약품 합성연구 등의 연구에 이용하오 있는 정도이고, 삼중수소의 활용에 관한 국내의 연구는 거의 전무한 상태이다.(중략)

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A Study on the Collection Efficiency of A Tritium Bubbler (삼중수소 버블러의 포집효율에 대한 고찰)

  • Shin Jae-sin;Lee Seung-Ho;Park Kwang-Ryeol
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • pp.172-181
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    • 2005
  • Collection Efficiency of a tritium bubbler being used at domestic nuclear power plants was studied. Equilibrium is attained while tritium vapour in air passes through the bubbler. When a lot of gas sample passes through the bubbler, the tritium concentration of water is raised and volume of water is decreased or increased. These phenomena give effect to the collection efficiency. Estimation of the tritium concentration of the water agreed with our experiments. If relative humidity is higher than 0.5, the efficiency becomes lower than 1 and if relative humidity is lower than 0.5, the efficiency becomes higher than 1, provided collected tritium is evaluated with original volume of the water. Though the relative humidity is riot 0.5, the efficiency can be maintained near 1 by making $\frac{saturated\; water\; vapour(cm^3_w)\times volume \; of \; gas \; sample(cm^3)}{volume\; of\; water(cm^3)}$ small

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촉매를 이용한 삼중수소수의 탈삼중수소반응

  • 정흥석;이한수;강희석;백승우;안도희;송명재;손순환
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.787-791
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    • 1995
  • 중수형 원자력발전소의 중수는 중성자 흡수반응에 따라 그 일부가 삼중수소화 된다. 삼중수소의 제거반응에 효율적인 고분자 백금촉매를 제조하여 회분식 반응기에서 탈삼중수소 반응실험을 수행하였다. 기액접촉반응탑내에서 고분자 촉매는 탈삼중수소 반응에 유효한 활성이 있음을 확인하였다.

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Determination of Springwater Characteristics by Measurement of Tritium in Water (삼중수소 측정에 의한 약수터 물의 수질특성 연구)

  • Kim, Jong Hun;Choi, Yong Wook;Chung, Taek Kyun
    • Journal of the Korean Chemical Society
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    • v.40 no.6
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    • pp.436-444
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    • 1996
  • The characteristics of water have been studied for 1 year by means of relationships between tritium and total dissolved solid(TDS), tritium and conductivity, tritium and chloride, and tritium and total hardness for 15 springs in the vicinity of Jeonju city of Korea. From the results of the study, the springs were divided into four characteristic groups, but the characteristics of most springwaters studied were similar to those of rainfall. Fifteen springwaters were evaluated to see if those are tasty and healthy using the Hashimoto's Mineral Balance Index. As a result, only one spring (J-4) was found as tasty and healthy.

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An Internal Tritium Concentration Analysis in Urine Samples as a Function of Submission Time after Airborne Tritium Intake at Korean Pressurized Heavy Water Reactors (중수로원전 방사선작업종사자의 공기중 삼중수소 섭취 후 뇨시료 제출 시간이 체내 삼중수소 농도에 미치는 영향 분석)

  • Kim, Hee-Geun;Kong, Tae-Young;Jeong, Woo-Tae;Kim, Seok-Tae
    • Journal of Radiation Protection and Research
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    • v.34 no.4
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    • pp.184-189
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    • 2009
  • In pressurized heavy water reactors, workers who enter radiation controlled areas must submit their urine samples to health physicists after radiation work; these samples are then used to monitor internal radiation exposure from tritium intake. This procedure assumes that the samples submitted represent tritium concentration inside the body at equilibrium. According to both technical reports from the International Commission on Radiological Protection and experimental results from Canadian nuclear utilities, tritium inside the body generally reaches equilibrium concentration after approximately 2-3 hours of intake. In practice, urine samples can be submitted either before the 2 hours mark or after several hours of radiation work because of the numerous tasks that workers must perform and their frequent entries during nuclear power plant maintenance. In this paper, tritium concentration in workers' urine samples was measured as a function of time submitted after radiation work. Based on the measurement results, changes in the tritium concentration inside the body and its effect on internal dose assessment were then analyzed. As a result, it was found that tritium concentration reaches equilibrium concentration before the 2 hours mark for most workers' urine samples.