• Journal of Radiation Protection and Research
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• 제46권4호
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• pp.194-203
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• 2021

Background: Surface soil radiation monitoring around nuclear facilities is important to classify and characterize the contaminated areas. A scanning and direct measurement technique can survey the sites rapidly before starting sampling analysis. Materials and Methods: Regarding this, we test and suggest a measurement technique for gross alpha/beta and ⁹⁰Sr activities in surface soil based on a mobile ZnS(Ag)/PVT (polyvinyltoluene) array and a handheld PVT rod, respectively. To detect ⁹⁰Sr selectively in soil mixed with naturally occurring radioactive materials, chosen energy channel counts from the multichannel analyzers were used instead of whole channel counts. Soil samples contaminated with exempt liquid ⁹⁰Sr with 1 Bq·g^-1, 3 Bq·g^-1, and 10 Bq·g^-1 were prepared and hardened by flocculation. Results and Discussion: The mobile ZnS(Ag)/PVT array could discriminate gross alpha, gross beta, and gamma radiation by the different pulse-shaped signal features of each sensor material. If the array is deployed on a vehicle, the scan minimum detectable concentration (MDC) range will be about 0.11-0.17 Bq·g^-1 at 18 km·h^-1 speed, highly sensitive to actual sites. The handheld PVT rod with 12 mm (Φ) × 20 mm (H) size can directly measure ⁹⁰Sr selectively if channels on which energies are from 1,470 and 2,279 keV are gated, minimizing crossdetection of other radionuclides. These methods were verified by measuring soil samples fabricated with homogeneous ⁹⁰Sr concentrations, showing static MDC of 2.16 Bq·g^-1 at a measurement time of 300 seconds. Conclusion: Based on the results, comprehensive procedures using these detectors are suggested to optimize soil sites survey.

• Journal of Radiation Protection and Research
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• 제38권2호
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• pp.52-59
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• 2013

전베타 방사능 분석법을 이용한 내부오염 스크리닝법을 검증하였고 실제 의료용 동위원소 생산시설 종사자 내부오염을 판단하는데 적용하였다. 종사자의 작업 종료 후 첫 번째로 채취된 뇨시료(spot 시료)와 24시간 동안 취합된 뇨시료(24 h 시료)를 채취하여 측정하였다. 특정 종사자의 경우를 제외하고 대부분의 측정결과는 일반인 체내 기저준위인 100 Bq $kg^{-1}$을 기준으로 22% 이내로 변동폭이 작았다. 측정결과 작업종료 후 수 시간 이내 종사자 뇨시료의 전베타 농도가 전반적으로 35% 이상 상승하는 경향이 있었다. 또한 스크리닝 결과와 작업일지를 바탕으로 작업장내부 구조상 오염을 유발하는 요인을 추정 할 수 있었으며 추가 세부 핵종별 분석법을 바탕으로 내부피폭선량을 평가해야 할 것으로 판단되었다. 한편 사업장에서 신속히 적용 가능한 내부오염평가 절차를 수립하였다.

• Nuclear Engineering and Technology
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• 제10권1호
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• pp.13-25
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• 1978

1970년 12월에서 1976년 12월 사이의 6년간 고리 원자력발전소 주변 환경에서 채취한 시료에 대하여 환경방사능을 측정조사하였다. 1976년에 채취한 공기미진에서 진알파 방사능과 1970년 12월에서 1976년 12월 사이에 채취한 시료인 토양, 물, 공기미진, 낙진, 솔잎, 빗물과 여런 식품시료에 페하여 전베타 방사능을 측정하였다. 시금치, 배추, 보리, 쌀, 뱀장어, 조기, 미역, 파해 및 우유 중에 함유된 스트론튬-90및 세시움-137 방사능은 방사화학적으로 분석하여 측정하였고 정수, 하천수, 바닷물 중의 트리튬도 전해법으로 농축하여 그 방사능을 측정하였다.

• Nuclear Engineering and Technology
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• 제51권4호
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• pp.1169-1175
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• 2019

The minimum detectable activity (MDA) value was derived according to the flow rate of the sample and degree of amplification of the device by sending the sample directly from the collection site to the detection part through a pump. This method can lead to reduction in time and cost compared to the existing measurement method that uses a pre-treatment process. In this study, experiments were conducted on $^3H$ and $^{90}Sr$, which are the major pure beta-emitting radionuclides, by setting the sample flow rate and the amplification gain as factors. The MDA values were derived according to the flow rates, considering that the flow rate can affect the MDA values. There were no change in the MDA under different flow rates of 0, 600, 800, and 1000 mL/min. Therefore, it was confirmed that the flow rate may not be considered when collecting samples for monitoring in actual field. As the degree of amplification of the amplifier increased, the time required to reach the target MDA decreased. When the amplification was quadrupled, the detection efficiency increased by approximately 23.4 times, and the time to reach the MDA decreased to approximately 1/550 times. This method offers the advantage of real-time on-site monitoring.

• Nuclear Engineering and Technology
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• 제5권3호
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• pp.240-248
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• 1973

고리에 위치한 원자력발전소 건설부지의 환경방사능의 측정보고이며 1970년 12월부터 1972년 11월 사이에 일광, 월내, 신암, 좌천, 소상 고리등 여섯개 지역에서 채취한 토양, 물, 솔잎, 낙진시료에 대하여 전방사능을 측정하였고 1972년에 채집한 채소류, 해산물 시료에 대하여 Sr-90 Cs-137의 방사능을 측정하였다. 각 시료의 측정처를 보면 그값은 계절적인 변화와 연차적인 감소천상을 나타내 주고 있다.

• Journal of Nutrition and Health
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• 제45권5호
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• pp.437-442
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• 2012

The purpose of this study was is to investigate the arthritis treatment and prevention of the effects the herbral administration to experimental animals induces arthritis 4 weeks for medicinal herbs (Scutellaria baicalensis Georgi, Acanthopanacis cortex, Achyranthis Radix). To investigate the prevention of histopathological examination and molecular biological examinations for arthritis improvement in vivo New Zealand, white rabbits were divided into a normal (Normal, n = 7), or a collagen-induced arthritis (CIA, n = 7), or a collagenase injection and medicinal herbs (SAA, n = 7). It was confirmed that induced arthritis was treated with Gross examination, and the measurement of average arthritis index (MAI) and improved arthritis by medicinal herbs. TNF-${\alpha}$ and IL-$1{\beta}$ were significantly increased in the CIA and SAA groups, compared to the normal group (p < 0.05). MMP-1 and TIMP-2 were significantly increased in the CIA, compared to the other groups (p < 0.05). MMP-1 and TIMP-2 were significantly decreased in the SAA group, compared to the CIA group (p < 0.05). As a result, Herbal administration used in this study might be able to help in the treatment of arthritis induced by inflammatory and immunosuppressive effects, that which can be expected.