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감마선 스펙트럼 비율을 이용한 매립 선원의 깊이 평가 방법론 개발 연구
김준하,정재학,홍상범,서범경,이병채,Kim, Jun-Ha,Cheong, Jea-Hak,Hong, Sang-Bum,Seo, Bum-Kyung,Lee, Byung Chae 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.1
This study was conducted to develop a method for depth assessment of embedded sources using gamma-spectrum ratio and for the evaluation of field applicability. To this end, Peak to Compton and Peak to valley ratio changes were evaluated according to <sup>137</sup>Cs, <sup>60</sup>Co, <sup>152</sup>Eu point source depth using HPGe detector and MCNP simulation. The effects of measurement distance of PTV and PTC methods were evaluated. Using the results, the source depth assessment equation using the PTC and PTV methods was derived based on the detection distance of 50 cm. In addition, the sensitivity of detection distance changes was assessed when using PTV and PTC methods, and error increased by 3 to 4 cm when detection distance decreased by 20 cm based on 50 cm. However, it was confirmed that if the detection distance was increased to 100 cm, the effects of detection distance were small. And PTV and PTC methods were compared with the two distance measurement method which evaluates the depth of source by the change of net peak counting rate according to the detection distance. As a result of source depth assessment, the PTV and PTC showed a maximum error of 1.87 cm and the two distance measurement method showed maximum error of 2.69 cm. The results of the experiment confirmed that the accuracy of the PTV and PTC methods was higher than two distance measurement. In addition, Sensitivity evaluation by horizontal position error of source has maximum error of less than 25.59 cm for the two distance measurement method. On the other hand, PTV and PTC method showed high accuracy with maximum error of less than 8.04 cm. In addition, the PTC method has lowest standard deviation for the same time measurement, which is expected to enable rapid measurement.
김형주 ( Hyung-ju Kim ),김성준 ( Sung-jun Kim ),이근영 ( Keun-young Lee ),서범경 ( Bum-kyung Seo ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Nuclides, such as Cesium (Cs), Strontium (Sr), and Cobalt (Co), separation using commercial polymeric membrane is investigated under room temperature to elucidate the permeation mechanism and possibility on applying commercial membranes to the separation of radioactive nuclides. Polyamide based commercial membranes are purchased to investigate their separation performance on single- and multi-component aqueous nuclides solutions. Reverse osmosis membranes are quite effective for the separation of Cs, Sr, and Co. Rejection is above 93% for single component and even higher for mixed nuclides separation, > 98%. This study indicates that reverse osmosis membranes can be one of the potential candidates for nuclides separation.
김형주 ( Hyung-ju Kim ),김성준 ( Sung-jun Kim ),이근영 ( Keun-young Lee ),서범경 ( Bum-kyung Seo ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Nuclides, such as Cesium (Cs), Strontium (Sr), and Cobalt (Co), separation using commercial polymeric membrane is investigated under room temperature to elucidate the permeation mechanism and possibility on applying commercial membranes to the separation of radioactive nuclides. Polyamide based commercial membranes are purchased to investigate their separation performance on single- and multi-component aqueous nuclides solutions. Reverse osmosis membranes are quite effective for the separation of Cs, Sr, and Co. Rejection is above 93% for single component and even higher for mixed nuclides separation, > 98%. This study indicates that reverse osmosis membranes can be one of the potential candidates for nuclides separation.
CdS/ZnS 양자점 기반 플라스틱 섬광체 제작 및 성능평가
민수정 ( Su Jung Min ),강하라 ( Ha Ra Kang ),이병채 ( Byung Chae Lee ),서범경 ( Bum Kyung Seo ),정재학 ( Jae Hak Cheong ),노창현 ( Changhyun Roh ),홍상범 ( Sang Bum Hong ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.3
현재, 감마 핵종 분석은 주로 무기섬광체 또는 반도체 검출기를 활용하여 여러 분야에 사용되고 있다. 이러한 검출기는 분해능이 좋지만 크기가 제한적이며, 가공성이 낮고 경제성이 플라스틱 섬광체보다 낮다. 따라서, 나노물질인 양자점과 플라스틱섬광체의 장점을 이용하여 양자점 나노물질 기반 플라스틱 섬광체를 개발하였다. 가장 많이 활용되고 있는 Cd계열 물질인 CdS/ZnS 양자점을 플라스틱 매트릭스에 교반하여 제작하였으며, 이를 <sup>60</sup>Co핵종 대상 계측 실험을 하여 상용플라스틱 섬광체의 성능과 비교 분석하였다. 상용플라스틱 섬광체 대비 CdS/ZnS 양자점 기반 플라스틱 섬광체가 20~30% 높은 효율을 보였다. 이는 의료분야뿐만 아니라 원자력 해체분야에서도 방사능 분석기로 활용 가능할 것으로 판단된다. Currently, gamma nuclide analysis is mainly used using inorganic scintillators or semiconductor detectors. These detectors have high resolution but there are less economical, limited in size, and low process ability than plastic scintillators. Therefore, quantum dot-based plastic scintillator was developed using the advantages of the quantum dot nanomaterial and the conventional plastic scintillator. In this study, efficient plastic scintillator was fabricated by adding CdS/ZnS based on the most widely used Cd-based nanomaterial in a polystyrene matrix. In addition, the performance of the commercial plastic scintillator was compared and it was analyzed through radiological measurement experiments. The detection efficiency of fabricated plastic scintillator was higher than commercial plastic scintillator, EJ-200. It is believed that this fabricated plastic scintillator can be used as a radioactivity analyzer in the medical and nuclear facility fields.
김형주 ( Hyung-ju Kim ),김성준 ( Sung-jun Kim ),이근영 ( Keun-young Lee ),서범경 ( Bum-kyung Seo ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Nuclides, such as Cesium (Cs), Strontium (Sr), and Cobalt (Co), separation using commercial polymeric membrane is investigated under room temperature to elucidate the permeation mechanism and possibility on applying commercial membranes to the separation of radioactive nuclides. Polyamide based commercial membranes are purchased to investigate their separation performance on single- and multi-component aqueous nuclides solutions. Reverse osmosis membranes are quite effective for the separation of Cs, Sr, and Co. Rejection is above 93% for single component and even higher for mixed nuclides separation, > 98%. This study indicates that reverse osmosis membranes can be one of the potential candidates for nuclides separation.