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서화중(Hwa-Jung Sheo),홍성운(Sung-Wun Hong),최종환(Jong-Hwan Choi) 한국식품영양과학회 1993 한국식품영양과학회지 Vol.22 No.1
광양만 여수만 순천만 보성만 거문도에서 어획한 수산물과 수질 및 sediment의 중금속 함유 실태를 조사하여 다음과 같은 결과를 얻었다. 지역별로는 광양만의 수산물에서 Cu를 최고 1.208ppm 그리고 sediment에서 Cu와 Pb를 각각 최고 2.13, 4.34ppm을 검출 하였다. 여수만의 수산물과 sediment에서 Hg을 각각 최고 0.102, 0.032ppm을 검출 하였다. 순천만의 수산물과 해수에서 Pb를 각각 최고 0.039ppm, 0.013㎍/L 검출하였다. 보성만의 수산물과 해수 및 sediment에서 Cd를 각각 최고 0.277ppm, 0.09㎍/L, 0.08ppm 검출 하였다. 거문도는 측정된 중금속 함량 수준이 제일 낮아 거의 청정해역이었다. 수산물 종류 별로는 민꽃게에서 Hg, Cu, Zn, Mn을 각각 최고 0.092, 1.905, 6.64, 46.34ppm을 검출하고 소라에서 Pb, Cd를 각각 최고 0.045, 0.38ppm을 검출하였다. 기타 꽃새우, 바지락, 청각, 톳은 중금속 함량수준이 낮았다. 조사한 5개지역의 수산물, 해수 및 sediment의 중금속 함량은 국내외의 중금속 허용 기준치를 벗어나지 않으므로 오염에 대한 우려는 없었다. In this survey the results showing the highest values among the analyzed data of all specimens are summarized as follow. At Kwangyang bay Cu in the fishery was detected up to 1.208ppm and the level of Cu and Pb in sediment of this area were 2.13 and 4.34ppm, respectively. The contents of Hg in fishery and sediment of Yeosu bay were 0.102 and 0.032ppm. The levels of Pb in fishery and seawater of Sunchon bay were 0.039ppm and O.013㎍/L, respectively. At Posung bay the contents of Cd were 0.277ppm, 0.09㎍/L and 0.08ppm in the specimens of fishery, seawater and sediment, respectively. The analyzed data of all specimens at Keamundo were very low level or undetectable. Of the 6 fishery samples, Charybdis japonica showed the upper level of Hg, Cu, Zn, Mn as 0.092, 1.905, 6.64, and 46.34ppm, respectively. The contents of Pb and Cd in Batillus cornatus were 0.045 and 0.38ppm respectively and other fishery had low level of heavy metal. In this study the contents of heavy metals analyzed in all specimens showed nearly natural occurrence level which is under the legal limits.
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단일광자방출단층촬영 영상에서 산란 및 감쇠 보정에 의한 절대방사능 측정
이정림,최창운,임상무,홍성운 ( Jeong Rim Lee,Chang Woon Choi,Sang Moo Lim,Seong Wun Hong ) 대한핵의학회 1998 핵의학 분자영상 Vol.32 No.4
Purpose: The pvrpose of this study was to evaluate the accuracy of radioactivity quantitation in Tc-99m SPECT by using combined scatter and attenuation correction. Materials and Methods: A cylindrical phantom which simulates tumors (T) and normal tissue (B) was filled with varying activity ratios of Tc-99m. We acquired emission scans of the phantom using a three-headed SPECT system (Trionix, Inc.) witb two energy windows (photopeak window: 126 154 keV and scatter window: 101 123 keV). We performed the scatter correction with dual-energy window subtraction method (k=0.4) and Chang attenuation correction. Three sets of SPECT images were reconstructed using combined scatter and attenuation correction (SC+AC', attenuation correction (AC) and without any correction (NONE). We compared T/B ratio, irnage contrast [(T-B)/(T+B)) and absolute radioactivity with true values. Results: SC+AC images had the highest mean values of T/B ratios. Image contrast was 0.92 in SC+AC, which was close to the true value of 1, and higher than AC (0.77) or NONE (0.80). Errors of true activity by SPECT images ranged from 1 to 11% for SC+AC, 22-47% for AC, and 2 16% for NONE in a phantom which was located 2.4cm from the phantom surface. In a phantom located 10,0cm from the surface, SC+AC underestimated by ?4%, NON.E 40%. However, AC overestimated by 10%. Conclusion: We conclude that accurate SPECT activity quantitation of Tc-99m distribution can be achieved by dual window scatter correc.tion combined with attenuation correction. (Korean J Nucl Med 1998;32:382-90)
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