• Title/Summary/Keyword: 라돈딸핵종

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A Study of the Rn-222 and Ra-226 Analysis in Aqueous Samples with a Low-Level Liquid Scintillation Counter and Pulse-Shape Analysis (저준위 액체섬광계수기와 파형분석법을 이용한 수용액 중 라돈-222 및 라듐-226의 분석법 연구)

  • Shin, Hyun-Sang;Lee, Chang-Woo;Lee, Myung-Ho;Cho, Yung-Hyun;Hong, Kwang-Hee;Choi, Geun-Sik
    • Analytical Science and Technology
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    • v.12 no.5
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    • pp.428-435
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    • 1999
  • A method for measuring Rn-222 and Ra-226 in aqueous sample using liquid scintillation counting technique has been studied. The Rn-222 was extracted easily from the water sample (10 mL) by 12 mL of xylene based organic scintillant. After radioactive equilibrium between Rn-222 and its alpha emitting decay products for three hours, the alpha activity from Rn-222 and its decay products were measured in a scintillation vial using the Wallae $1220^{TM}$ Quantulus liquid scintillation counter. Ra-226 concentration in aqueous sample was determined, after isolation of Ra-226 from the sample matrix, by extraction the ingrowth of the Rn-222 and its alpha emitting decay products with xylene based organic scintillant. The optimum pulse-shape analysis (PSA) value was evaluated by the figure of merit (FM) criterion. Minimum detectable activity (MDA) is about 0.14 Bq/L (3.78 pCi) for the region of Rn-222 and its alpha emitting decay products and 0.06 Bq/L (1.63 pCi) for the region of Po-214 respectively, with 200 min, counting time at PSA level 100 in the low-diffusion polyethylene vial and xylene based cocktail solution. Experiment on the optimum sample-cocktail volume ratio, the influence of agitation and the diffusion of radon from vial were carried out.

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Study on the Measurement of Radon concentrations in soil samples using γ-spectrometer (γ-spectrometer를 이용한 토양시료의 라돈농도 측정법에 관한 연구)

  • Kang, Sunga;Lee, Sangsoo;Choi, Guirack;Lee, Junhaeng
    • Journal of the Korean Society of Radiology
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    • v.7 no.1
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    • pp.31-36
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    • 2013
  • The radioactive gas radon ($^{222}Rn$), which is generated from the decay process of uranium ($^{238}U$) originating from the soil of more than 85 percent higher the porosity of the soil, the soil can radiate out the possibility that many isotopes. In order to protect the human body from radon, above all, the development of accurate measurement techniques to formulate appropriate measures should be followed. This study Gamma-ray spectrometry using a high purity germanium (HPGe) detector, if you want to measure radon unstable the nature radiation of the background problems can be reduced, radium and radon daughter nuclides after radioactive equilibrium leads to Radon concentration was measured, the soil samples from the Gamma-ray emitting nuclides, and the energy spectrum is analyzed.

Measurement of $^{222}Rn$ in ground water with low-level Liquid Scintillation Counter and pulse shape analysis (저준위 액체섬광계수기와 파형분석법을 이용한 지하수중의 $^{222}Rn$ 측정)

  • Jo Su-Yeong;Yun Yun-Yeol;Lee Gil-Yong;Kim Yong-Je
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2006.04a
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    • pp.319-323
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    • 2006
  • 파형분석(PSA) 기능과 백그라운드 낮고 계측효율이 높은 장점을 가지고 있는 저준위 액체섬광계수기를 이용하여 지하수중의 $^{222}Rn$ 측정을 위한 최적 분석조건을 확립하였다. 라돈분석을 위해 섬광용액 HiSafe 3 12 ml를 사용하여 물시료 8 ml 내 $^{222}Rn$ 을 측정하였다. 라돈은 딸핵종과의 방사평형을 위해 3시간동안 방치한 후 계측하였다. 최적 파형분석 (PSA) 준위는 100 이었다. $^{222}Rn$의 계측효율은 $^{226}Ra$ 표준시료를 동일 조건으로 제조한 후 약 20일 이상 방치한 다음 측정하여 결정하였으며 측정효율은 약 $91.6{\pm}3.6%$ 이었다. 동일 시료의 라돈 추출실험 재현성은 2 % 이내이었다. 계측시간 10시간을 기준으로 바탕값은 0.035 cpm 이었고 300분 계측시 검출하한값은 0.11 Bq/L 이었다.

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Evaluation of Radioactive Stack Air Effluents from the Advanced Fuel Science Building at KAERI (한국원자력연구원 새빛연료과학동 굴뚝방출 방사능 평가)

  • Chang, S.Y.;Kim, B.H.
    • Journal of Radiation Protection and Research
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    • v.33 no.3
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    • pp.121-126
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    • 2008
  • Radioactivities of the stack air effluents from the Advance Fuel Science Building (AFSB) at KAERI have been investigated and evaluated. In this AFSB, nuclear fuels for the HANARO research reactor have been fabricated and the advanced nuclear fuels have been studied. A stack air monitoring system has been continuously operating to monitor the stack air effluents from the facility to protect the environment. As the results of the periodical radioactivity measurement and both the gamma and alpha spectrometry for the millipore filters taken from the stack air monitor from January until March 2008, a trace amount of primordial $^{40}K$ and the short-lived decay products of natural borne $^{222}Rn$ and $^{220}Rn$ have been detected. However, the radioactivities have rapidly decayed to the level below the Minimum Detectable Activity (MDA) of the counting system. Therefore, it was evaluated that no uranium isotopes have been released to the atmosphere from the stack of the AFSB at KAERI.

Measurement of Rn-222 Gas Concentration of Newly Constructed Apartment House in Gwangju Gwangsan-Gu (광주광역시 광산구 소재 신축 아파트 라돈가스 농도 계측)

  • Jang, Hee jun;Lee, Sang bock
    • Journal of the Korean Society of Radiology
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    • v.9 no.4
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    • pp.257-261
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    • 2015
  • Radon is produced after the Uranium-238 and thorium-232 undergone radioactive decay process is a colorless, odorless inert gas is stored in a basement or an enclosed space. Building materials are made by a rock or soil materials. Form of radon gas is introduced into the lungs through the respiratory tract and deposited in the lungs or bronchial Daughter nuclides radon causes lung cancer. In this study, To subject the Constructed Apartment in Gwangju Gwangsan-Gu, the position is closed window and opened window was measured using a measuring instrument for radon. The measured results indicate that the measurement was carried out in concentrations of radon gas measured at Newly Constructed Apartment is low than United states in the radon concentration in air public 4 pCi called radon gas baseline maximum allowable concentrations. The exposure caused by radon concentration of new construction apartment when on the measurement results is expected to be insignificant. However, when radon gas like this is that it accumulates in the body and lungs get damaged due to exposure, such as lung cancer often open the windows to reduce the radon concentration measurements, such as in radiation protection aspects to the ventilation to reduce exposure it is considered necessary.

Evaluation of Indoor Radon Levels in a Hospital Underground Space and Internal Exposure (의료기관 지하시설의 라돈가스 측정과 내부피폭 조사)

  • Song, Jea-Ho;Jin, Gye-Hwan
    • Journal of the Korean Society of Radiology
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    • v.5 no.5
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    • pp.231-235
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    • 2011
  • Radium is rock or soil of crust or uranium of building materials and thorium after radioactivity collapse process are created colorless and odorless inert gas that accrue well in sealed space like mine or basement. It inflow to lung circulate respiratory organ and caused lung cancer because of deposition of lung or bronchial tubes. Radium sheath of medical institution treat person's life is possible big danger to professional regarding radioactivity who has much amount exposed radioactivity and weaker immune patient. so we do this test. Using measuring instrument at test is real time radium measuring instrument, Professional Continuous Radon monitor, and measuring places are basement first floor and second floor of two hospitals and measure from 10 a.m to 3 p.m. Measurement result of Professional Continuous Radon monitor is minimum 14.8 Bq/$m^3$ to maximum 70.3 Bq/$m^3$ and show domestic baseline below 148 Bq/$m^3$, effective dose-rate is minimum 0.296 mSv to maximum 1.406 mSv that show 2.4 mSv, 10~58.3% level, exposed radiation amount from nature radiation one year.

Elementary School in Gwangju Gwangsan Radon gas Density Measurement (광주광역시 광산구 소재 초등학교 라돈가스 농도 계측)

  • Ahn, Byungju;Oh, Jihoon
    • Journal of the Korean Society of Radiology
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    • v.8 no.4
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    • pp.211-216
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    • 2014
  • Radium is rock or soil of crust or uranium of building materials after radioactivity collapse process are created colorless and odorless inert gas that accrue well in sealed space like basement. It inflow to lung circulate respiratory organ and caused lung cancer because of deposition of lung or bronchial tubes. In this study, the air in the elementary school classroom nongdoeul tonkatsu place of measured values were compared using the calculated annual internal radiation exposure. La tonkatsu exposure measured in primary school classroom at least five schools when you close the windows in the average floor 0.56mSv 2 floors ground floor windows when opened 0.384mSv 048mSv 3 floors, 2 floor levels of the same three layers 0.31mSv 0.296mSv the human exposure to radon and radiation on the first floor of 3 floors above ground in a lot of exposure was moderate. When you close the window from the first floor up 0.384mSv 056mSv 3 floors with a minimum annual radiation exposure due to natural radiation in the 16 to 23.3 percent minimum 2.4mSv accounted for. When I opened the window to the maximum annual radiation exposure 2.4mSv 0.296mSv 0.31mSv least a minimum of 12.3 to 12.91% accounted for Results suggest that more than five chodeunghakgyoeun La tonkatsu domestic radon measurements conducted below regulatory requirements and internal exposure has also fall within the normal range. People The less the radiation exposure to the human body because it reduces the impact in the classroom in elementary school vent windows often reduced to the maximum radon concentration in the air, if called tonkatsu be able to reduce radiation exposure for the immune system is weak and elementary will be helpful to experiment more in the future for the school authorities called tonkatsu investigation is done to him if the action to establish a more secure school building facilities is thought would be helpful.