• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.589-593
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• 1998

활성탄 검출기를 이용하여 실내 라돈농도를 측정하였다. 라돈농도 측정을 위한 활성탄 검출기의 노출기간은 4일, 5.8일, 5일이었다. 측정결과 사무실내 라돈농도는 각각 1.63 pCi/$\ell$, 1.23 pCi/$\ell$, 1.76 pCi/$\ell$였으며, 측정기간 동안 평균 1.54 pCi/$\ell$였다. 이 결과는 미국 환경보호청에서 제시한 조치준위의 최저치인 4 pCi/$\ell$ 이하였다. 같은 장소에서 WL Meter를 이용하여 라돈 딸핵종의 농도를 축정한 결과, 각각 5. 64 mWL, 4.88 mWL, 6.43 mWL이었다. 라돈과 라돈 딸핵종 농도로부터 라돈평형인자 값을 산출한 결과 각각 0.34, 0.39, 0.36으로, 이 결과는 다른 방법에 의해 타 연구자가 측정한 기존의 사무실내 라돈농도 및 라돈평형인자 산출결과와 비교적 유사했다. 따라서 활성탄 검출기를 이용한 라돈농도 측정법은 매우 유용한 방법임을 확인할 수 있었다.

• Journal of Radiation Protection and Research
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• v.32 no.3
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• pp.97-104
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• 2007

The corelation between the indoor volume and the measured radon concentration has been analyzed by comparing the radon concentration and the indoor volume of apartment rooms in Jeonju City. We also measured the annual exposure dose based on the variation in indoor radon concentration over time. To do this, we took 8 larger rooms and 8 smaller rooms of apartment, respectively, as a sample. The average volume of the larger rooms and that of the smaller rooms were $31.59\;m^3$ and $16.82\;m^3$, respectively. The average radon concentration of the larger rooms and that of the smaller rooms turned out to be $71.73\;Bq/m^3$ and $108.51\;Eq/m^3$, respectively. indicating that indoor volume is in inverse proportion to the radon concentration, i.e., the bigger the ratio of the surface area/volume, the higher the indoor radon concentration. From the measurement of the variation in indoor radon concentration over time fur a single day, the average intraday radon concentration variation was found to be about $46.8\;Bq/m^3$. The highest level of concentration ($114.5\;Bq/m^3$) was measured between 8 and 10 AM and the lowest level of concentration ($67.7\;Bq/m^3$) between 2 and 4 PM. The annual exposure dose turned out to be in the range of 0.3 mSv/yr to 2.16 mSv/yr, showing that the dose in some apartments exceeded 1.3 mSv/yr, the numerical value presented by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR).

• The Journal of Engineering Geology
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• v.10 no.2
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• pp.189-214
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• 2000

Three study areas of Kwanak campus(Seoul National University), Gapyung and Boeun were selected and classified according to bedrock types in order to investigate soil-gas radon concentrations. Several soil-gas samples showed relatively high radon concentrations in the residual soils which derived from granite bedrock. It also showed that water content of soil and the degree of radioactivity disequilibrium was a secondary factor governing radon emanation and distribution of radon radioactivity. The results of radon concentrations and working levels for forty rooms in Kwanak campus, Seoul National University, showed that indoor basement rooms under poor ventilation condition can be classified as high radon risk zone having more than EPA guideline(4 pCi/L). Some results of section analysis which was surveyed in the fault zone of Kyungju and Gapyung area confirmed the existence of fault-associated radon anomalies with a meaning of radon risk zone.

• Journal of Radiation Protection and Research
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• v.18 no.1
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• pp.37-51
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• 1993

A standard radon chamber and a radon generator adjusted by ventilation system which had used in this research were assumed to calculate theoretically the concentration of radon progeny using Jacobi model theory. On the one hand, the filter sampled from the radon standard chamber and the radon generator was measured and analysed by the alpha spectrometry method. It is clear that measured result shows a good agreement with theoretical result. Therefore, it is observed that this research can made a great contribution to more accurate internal dose assessment by alpha emission of radon progeny in indoor radon environment, and fast individual measurement and determination of concentration for radon progeny.

• Proceedings of the KSEEG Conference
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• 2003.04a
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• pp.85-87
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• 2003

토양환경에서의 라돈포텐셜이란 토양의 공극에 존재하여 실내환경으로 유입될 수 있는 가능성을 가진 라돈의 농도 개념으로 해당지반을 대표하는 라돈방사능 수준을 의미한다(제현국, 2002). 해당 지반에서 라돈포텐셜을 정량화 할 수 있으면 타 지반과의 상대적인 비교를 통하여 라돈방사능의 수준을 알 수 있으나 토양환경에서 변화양상이 심한 라돈의 특성으로 인해 정확한 라돈포텐셜을 예측한다는 것은 사실상 불가능하다. (중략)

• Journal of radiological science and technology
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• v.40 no.1
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• pp.127-134
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• 2017

The purpose of this study was to assess the impact by comparing the concentration of indoor radon and look for ways to lower the concentration of indoor radon gas measurements of three variables, the year of completion, volume of the building and ventilation. Measurement target is six classrooms on the sixth floor of building that was constructed in 1973 and was extended in 2011. Selected classroom's volume is different. Four classrooms were selected to compare the radon concentration in accordance with the year of completion, Classrooms that is same year of completion were selected to compare the radon concentration in accordance with the volume, six classroom was performed closure and ventilation to compare radon concentration according to ventilation. Radon concentrations in accordance with the year of building completion showed a high concentration of radon in a building recently built. Also, Radon concentration in volume is high the smaller the volume. Radon concentration change according to ventilation showed a reduction of about 80% when the ventilation than during closing. Especially, The radon concentrations were high detected while the recently year of building completion and the smaller volume. Ventilation of the three variables is considered that can be expected to exposure reduction effect by radon affecting the greatest radon concentration reduction.

• 대한방사선방어학회:학술대회논문집
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• 2011.11a
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• pp.144-145
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• 2011

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.127-128
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• 2001

라돈은 사람들이 노출되는 자연 방사능 중 가장 큰 부분을 차지하며, 전체 자연 방사능 중 약 50%를 차지한다. 라돈의 인체영향 대부분이 호흡을 통한 인체 내에 유입에 의한 것으로 알려져 있다. 라돈에 의한 인체영향과 대기 중 오염물질의 장거리 이동에 대한 연구를 위해 대기 중 라돈의 거동특성 연구가 필요하다. 또한 라돈농도의 지역적 분포와 시간변화에 대한 정보는 지역적 특성, 라돈의 배출, 대기 중 습성에 대한 라돈 연구에 중요하다. (중략)

• Journal of Korean Society of Environmental Engineers
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• v.28 no.6
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• pp.588-595
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• 2006

Indoor radon($^{222}Rn$) concentrations of subway stations in Seoul area were measured to survey the environmental indoor radon levels and to identify sources of radon. The radon concentration of indoor air by method of long-term measuring with a-track detector were surveyed at 232 subway stations from 1998 to 2004. And the radon concentration in ground-water was measured with a method of alpha particle counting. To trace main source of radon, 8 out of 232 stations were selected and their radon concentrations in tunnel and on platform were analyzed. Total geometric mean and arithmetic mean of radon concentrations in all stations from 1998 to 2004 were $1.40{\pm}1.94pCi/L,\;1.65{\pm}1.07$ respectively. Geometric means of radon concentrations on platform and concourse were $1.54{\pm}1.96pCi/L,\;1.23{\pm}1.88pCi/L$ respectively, with higher concentration at the platform than at the concourse. The geological structure was significantly correlated to the indoor radon concentration in subway stations region. Radon concentrations of adjacent tunnel and ground-water of subway station was significantly correlated to the indoor radon concentration in subway stations. And There was a significant difference in radon concentration, depending on the depth levels in platform of subway stations(p<0.05).

• Journal of the Korean Society of Radiology
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• v.9 no.6
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• pp.421-424
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• 2015

In this study, To subject the constructed at N-kindergarten in G-city, 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 N-kindergarten is low than United States in the radon concentration in air public 4pCi called radon gas baseline maximum allowable concentrations. As a result, radon exposure is not a problem, but when the accumulation radon gas in the lungs, get damaged same lung cancer. Be defensive of kindergarten windows open for ventilation and dust removal be possible to reduce the exposure.