核子醫學科之環境輻射背景評估

針對林新醫院核子醫學科2010年成立的新的正子電腦斷層掃描/電腦斷層掃描（positron emission tomography/computed tomography, PET/CT）儀與單光子電腦斷層掃描（single-photon emission computed tomography, SPECT）儀，進行可能增加的環境輻射研究。本計畫使用準確性的熱發光劑量計（thermoluminescent dosimeter, TLD-100H），佈點於核子醫學科進行六個月的環境輻射背景測量。實驗結果顯示核子醫學科內的等候室、注射室以及PET/CT檢查室內輻射劑量有明顯的變化，而在科內地區的平均輻射劑量範圍由0.13±0.02至4.12±0.62 mSv/mo之間。再將科內分成四地區，t-test證明這些區域有顯著不同，佈點期間台中市其他地區的背景值為0.13±0.03至0.16±0.03 mSv/mo。這些實驗數據顯示在院內的工作人員，所接受到的輻射劑量值，是在合理可接受的限制內的，遠低於輻射工作人員的職業曝露限制以及ICRP 60所推薦的劑量限度。

關鍵字

熱發光劑量計；正子電腦斷層掃描/電腦斷層掃描；單光子電腦斷層掃描；環境輻射

並列摘要

This study demonstrates a possible increase in environmental radiation background at the Nuclear Medicine Department (NMD) in Lin Shin Hospital, resulting from the new operated positron emission tomography/computed tomography (PET/CT) and single-photon emission computed tomography (SPECT) founded in 2010. Therefore, the environmental radiation dose rates may be higher than before. Environmental radiation backgrounds were evaluated by the accurate and sensitive thermoluminescent dosimeter (TLD-100H) among NMD during six month surveys. Measured results indicated that patient waiting rooms, injection rooms and PET/CT operation room, and staff working area had significantly different radiation dose rates. These averaged environmental radiation dose rates ranged from 0.13±0.02 to 4.12±0.62 mSv/mo among NMD. NMD areas were divided into four parts and t-test demonstrated environmental radiation doses were significantly different among these parts. Environmental radiation dose rates of Taichung City ranged from 0.13±0.03 to 0.16±0.03 mSv/mo. These preliminary data showed that the radiation doses of staffs are within the acceptable limits and far lower than ICRP 60 recommended.

並列關鍵字

thermoluminescent dosimeter ； positron emission tomography/computed tomography ； single-photon emission computed tomography ； environmental radiation

國際替代計量

核子醫學科之環境輻射背景評估

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