• 한국환경과학회지
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• 제15권7호
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• pp.689-694
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• 2006

To examine inshore radioactive contamination caused by nuclear power plants, nuclear testing, hospital and laboratory, both gross ${\beta}$-radioactivity and ${\upsilon}$-spectrometry were measured. The measurements were taken with the Abalone and Top shell, which had been collected from the four different sites at the coast in Jeju-do (Seongsan, Deajeong, Wimi, Dodu). The activity ranges of concentration were respectively 0.11-0.29 Bq/kg-wet for $^{90}Sr$, 0.01-0.04 Bq/kg-wet for $^{137}Cs$, 36 - 53 Bq/kg-wet for $^{40}K$ in shellfish on the Jeju island. The radioactivities of $^{90}Sr$, $^{137}Cs$ and $^{40}K$ were similar to those in sampling location of shellfish in the coastal on the Jeju island. The radioactivity of $^{90}Sr$ for the Abalone was lower level than that for Top shell. The radio- activity of $^{137}Cs$ for the Abalone was similar to that for the Top shell. But the radioactivity of $^{40}K$ for the Abalone was higher level than that for the Top shell. As a result, the gross ${\beta}$-radioactivity observed was similar to that in nature. Among radionuclides, only $^{90}Sr$, $^{137}Cs$ and $^{40}K$ were detected in a very small amount, and each was also close to the natural levels.

• 한국환경농학회지
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• 제26권2호
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• pp.186-191
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• 2007

1998년부터 2006년까지 국내 방사능 교차분석에 참여하여 제주지역의 환경방사능 감시를 위한 방사능 분석 기술의 능력 검증과 신뢰도를 확보하기 위하여 수행되었다. 전베타 방사능 분석 시료는 공기부유진 필터와 물이었고, 감마 분석은 토양과 물 시료 중 자연 및 인공 방사성 핵종들이었다. 전베타 방사능 분석 값은 1998년과 1999년 물 시료를 제외하고는 모두 신뢰도 범위내의 값을 가졌고, 감마 핵종은 토양 시료 중의 $^{40}K$와 $137^{CS}$ 그리고 물 시료 중 몇 개의 핵종을 제외하고는 대부분 매우 우수한 평가를 받았다. 따라서 방사선 이상 사고시 원자력 안전을 위한 제주지역의 환경방사능 감시를 위한 신뢰도를 확보하여 자체적으로 환경방사능을 분석할 수 있는 능력을 함양하였다.

• Nuclear Engineering and Technology
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• 제52권6호
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• pp.1282-1288
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• 2020

In the first study, the Radon emanation and radiological hazards associated with radionuclides in soil samples, collected from 9 various date palm farms located in 3 different districts in Saudi Arabia were determined through a high purity Germanium (HPGe) gamma-ray spectrometer. The estimated average values of Radon emanation coefficient and Radon mass exhalation rate for soil samples were 0.535 ± 0.016 and 50.063 ± 7.901 mBqkg^-1h^-1, respectively. The annual effective dose of radionuclides in all sampling locations was found to be lower than UNSCEAR's recommended level of 0.07 mSvy^-1 for soil in an outdoor environment. In the secondary study, gross α and gross β activities in soil and date palm pits samples were measured by a low background α/β counting system. Average values of gross α and gross β activities in soil and date palm pits samples were 5.761 ± 0.360 Bqkg^-1, 38.219 ± 8.619 Bqkg^-1 and 0.556 ± 0.142 Bqkg^-1, 24.266 ± 1.711 Bqkg^-1, respectively.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2017년도 춘계학술논문요약집
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• pp.379-380
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• 2017

• 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.

• Childhood Kidney Diseases
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• 제20권1호
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• pp.6-10
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• 2016

Poststreptococcal glomerulonephritis (PSGN) is one of the most recognized diseases in pediatric nephrology. Typical clinical features include rapid onset of gross hematuria, edema, and hypertension, and cases are typically preceded by an episode of group A ${\beta}$-hemolytic streptococcus pharyngitis or pyoderma. The most common presenting symptoms of PSGN are the classic triad of glomerulonephritis: gross hematuria, edema, and hypertension. However, patients with PSGN sometimes present with unusual or atypical clinical symptoms that often lead to delayed diagnosis or misdiagnosis of the disease and increased morbidity. Additionally, the epidemiology of postinfectious glomerulonephritis (PIGN), including PSGN, has changed over the past few decades. This paper reviews atypical clinical manifestations of PSGN and discusses the changing demographics of PIGN with a focus on PSGN.

• 대한물리의학회지
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• 제14권2호
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• pp.97-105
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• 2019

PURPOSE: This study examined the factors related to school-based activity performance in school-aged children with spastic cerebral palsy (CP). METHODS: The Gross Motor Function Systems (GMFCS), Manual Ability Classification System (MACS), Communication Function Classification System (CFCS) as functional classifications, and the physical activity performance of the School Function Assessment (SFA) were measured in 79 children with spastic CP to assess the student's performance of specific school-related functional activities. RESULTS: All the function classification systems were correlated significantly with the physical activity performance of the SFA ($r_s=-.47$ to -.80) (p<.05). The MACS (${\beta}=-.59$), GMFCS (${\beta}=-.23$), CFCS (${\beta}=-.21$), and age (${\beta}=-.15$) in order were predictors of the physical activity performance of the SFA (84.8%)(p<.05). CONCLUSION: These functional classification systems can be used to predict the school-based activity performance in school-aged children with CP. In addition, they can contribute to the selection of areas for intensive interventions to improve the school-based activity performance.

• 한국융합학회논문지
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• 제10권3호
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• pp.347-354
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• 2019

본 연구의 목적은 성인 선천성 심장 질환자의 불확실성과 삶의 질 간의 관계를 파악하기 위한 서술적 상관 관계연구이다. S시에 있는 종합 병원의 성인 선천성 심장 질환자 136명을 대상으로 하였다. 삶의 질은 불확실성과 대근육 운동기능 영역(r=-.15, p=.041), 인지(r=-18, p=.014), 통증(r=-.14, p=.045), 일상 생활(r=-.15, p=.039), 활력(r=-.16, p=.029)에서 모두 음의 상관관계가 있었다. 성인 선천성 심장 질환자의 대근육 운동 기능 영역, 일상 생활을 투입한 회귀모형은 유의한 것으로 나타났으며(F=6.15, p=.018), 모형의 설명력은 22.0%였다. 이를 통해 성인 선천성 심장 질환자의 불확실성을 개선시키기 위해서는 대근육 운동 기능 영역 및 일상 생활 기능을 증진시킬 수 있는 중재 프로그램이 제공되어야 할 필요가 있음을 알 수 있었다.

• 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.

• Journal of Radiation Protection and Research
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• 제42권4호
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• pp.189-196
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• 2017

Background: The effects of radiation on tissues vary depending on the radiation type. In this study, a minipig model was used to compare the effects of ${\beta}$-rays from $^{166}Ho$ and ${\gamma}$-rays from $^{60}Co$ on the skin. Materials and Methods: In this study, the detrimental effects of ${\beta}$- and ${\gamma}$-irradiation on the skin were assessed in minipigs. The histopathological changes in the skin from 1 to 12 weeks after exposure to 50 Gy of either ${\beta}$- (using $^{166}Ho$ patches) or ${\gamma}$- (using $^{60}Co$) irradiation were assessed. Results and Discussion: The skin irradiated by ${\beta}$-rays was shown to exhibit more severe skin injury than that irradiated by ${\gamma}$-rays at 1-3 weeks post-exposure; however, while the skin lesions caused by ${\beta}$-rays recovered after 8 weeks, the ${\gamma}$-irradiated skin lesions were not repaired after this time. The observed histopathological changes corresponded with gross appearance scores. Seven days post-irradiation, apoptotic cells in the basal layer were detected more frequently in ${\beta}$-irradiated skin than in ${\gamma}$-irradiated skin. The basal cell density and skin thickness gradually decreased until 4 weeks after ${\gamma}$- and ${\beta}$- irradiation. In ${\beta}$-irradiated skin lesions, and the density and thickness increased sharply back to control levels by 6-9 weeks. However, this was not the case in ${\gamma}$-irradiated skin lesions. In ${\gamma}$-irradiated skin, cyclooxygenase-2 (COX-2) was shown to be expressed in the epidermis, endothelial cells of vessels, and fibroblasts, while ${\beta}$-irradiated lesions exhibited COX-2 expression that was mostly limited to the epidermis. Conclusion: In this study, ${\beta}$-rays were shown to induce more severe skin injury than ${\gamma}$-rays; however, the ${\beta}$-rays-induced injury was largely repaired over time, while the ${\gamma}$-rays-induced injury was not repaired and instead progressed to necrosis. These findings reveal the differential effects of ${\gamma}$- and ${\beta}$-irradiation on skin and demonstrate the use of minipigs as a beneficial experimental model for studying irradiation-induced skin damage.