正子斷層造影(Position Emission Tomography, PET)已成爲現今核子醫學檢查的最新趨勢，越來越多患者願意自費接受正子斷層造影做腫瘤鑑別診斷，因此正子斷層造影的患者檢查人數持續成長中，病患檢查人數大幅增加，對於醫事人員及周圍環境的輻射防護措施就愈顯其重要。核子醫學檢查中，正子斷層造影與單光子斷層造影(Single Photon Emission Computed Tomography, SPECT)爲主要之言表斷儀器，本研究計劃使用此設備在周圍環境與醫事人員身體表面進行輻射劑量量測比較。利用熱發光劑量計TLD-100及TLD-100H量測正子斷層造影中心及單光子電腦斷層造影室周圍環境劑量及醫事人員所接收之劑量，主要佈點位置分爲三部分，第一部分爲在正子斷層造影室及單光子電腦斷層造影室周圍環境之量測，以廁所、控制及影像處理室、注射室、走廊接待室等不同位置進行佈點。第二部分爲針對醫事人員進行甲狀且泉、性腺、肺臟、腎臟四個不同部位表面吸收劑量之量測。第三部分爲在掃描室中，以檢查床至控制室1公尺至4公尺之距離放置熱發光劑量計進行量測。研究結果顯示，以正子斷層造影室及單光子電腦斷層造影室周圍環境劑量中，在檢查室部分，以正子斷層造影室較高爲每天6.64μSv。在控制室部分，以單光子電腦斷層造影室較高爲每天2.04μSv。在人員部份，注射人員所受劑量與國外研究論文相比低了許多，國外注射人員，接待人員平均每次接收之劑量爲7.85μSv，本研究所測得值爲7.25μSv。顯示國外整體劑量，比國內高了許多。經過統計分析可得知整個接觸患者時間拉長、即呈現較高之吸收劑量。因此，加強鉛屏蔽以減少注射人員的吸收劑量是必要的。

Positron emission tomography (PET) has become the trend in the current field of nuclear medicine. More and more patients receive PET for tumor diagnosis extras a self-paid service and the population is still growing. The working staff of PET laboratories also receive increasing radiation from the imaging agent, therefore, measures to protect personnel from radiation are even more important. Among the instruments of nuclear medicine, PET and single photon emission computed tomography (SPECT) are two of the major diagnosing tools. This study measures and compares the radiation doses of these two examinations in order to provide information for personnel protection. This study uses thermoluminescent dosimeters TLD-100 and TLD-100H to measure the radiation doses received by working staff of PET and SPECT laboratories in a medical center. The deployment of dosimeters includes three parts. First is the space surrounding PET examination room, including lavatories, injection room and passage. Second is the place inside the scanning room, including the examination bed and the points 1 to 4 meters away. The final is the body parts of working staff, thyroid, genital glands, lungs and kidneys. The results reveal that the average effective dose of medical personnel is about 12.5μSv per year and it is lower when comparing with those in other countries. This may be because the radiology technicians in other countries have to conduct injections and orientation to the patients in addition to photography and therefore have longer contact to patients carrying radioactive agents. The absorbed radiation of staff in charge of injections is the highest among all the staff, so it is necessary to increase lead shield protection for the injection operator in order to reduce their absorbed doses.