近幾年，隨著國內飼養寵物之比例逐年上升，動物醫院之數量亦呈現增加之趨勢。基於某些健康之因素，動物會被送至動物醫院進行診斷及治療，獸醫師通常會透過 X 光影像輔助診斷。動物進行 X 光照射時，大部分需要輔助者於X光室內協助固定動物，因 此該輔助者會接受到一定程度之劑量。故本研究之目的為建立輔助者於 X 光室內劑量之量測方法並評估該輔助者所接受之劑量以及提供相關輻射防護之建議。
本研究之實驗設計為放置自製假體於距離照野中心 50 公分處，並於假體上黏貼 TLD，相同位置亦放置 AT1121 及個人劑量佩章進行量測。並使用MCNP模擬進入 TLD之散射輻射有效能量以及自製假體與 ICRU假體之間劑量轉換因子。結果顯示如需使用個人劑量佩章進行動物用 X 光室內之輔助人員劑量監測則需多次曝露，使劑量值高於最低可測劑量值。另外，使用AT1121 時應調整為 Tvar 模式，較能準確地量測到該次曝露所造成之劑量。並於研究最後提供一劑量計算式，透過該計算式可以將 AT1121 之量測值轉換為 TLD 之劑量值後，再乘上 E/H*(10)之轉換因子得到有效劑量，用以評估輔助人員所可能接受之劑量。

In Taiwan, the number of veterinary hospital is growing rapidly in nearly two decades. For some health reasons, the pet is usually sent to a veterinary hospital to perform the X-ray inspection. Because the pet breeder needs to accompany the pet inside the X-ray room during the X-ray inspection in most cases, the breeder or helper in the X-ray room is also exposed to the scattered X-ray
radiation. Thereby, the purpose of this study is to build the
method to evaluate the helper’s dose and investigate the exposed effective doses of the helpers inside the X-ray inspection room during general veterinary radiographic procedures.
Over 40 veterinary hospitals were inspected on-site in this study. The doses were mainly measured using a plastic scintillation survey meter (Atomtex AT1121), the thermoluminescent dosimeters (TLDs) and personnel dose badges in some cases. By means of setting the survey meter at the position of the pet breeder's (helper's) body which is assumed at a distance of 50 cm from X-ray
field center, and considering the conditions of wearing with and without lead apron respectively. The ambient dose equivalents were measured by the survey
meter. And the measured ambient dose equivalents were transferred into effective dose by considering the conversion factors suggested in EURADOS RP 106 report. Besides, Monte Carlo (MCNP) simulation was used to simulate the effective energy of scattered radiation and the conversion factors of the experimental phantom to the ICRU phantom.
The results show that the personnel dose badge may not be an appropriate dosimeter to evaluate the dose of helper inside the X-ray room since the dose per inspection is too low. Doses measured by different dosimeters are discussed and presented in this study. Besides, the helper’s dose measured by AT1121 should operate in Tvar mode instead of T mode. In the result of this paper, a
formula is provided to convert the ambient dose equivalent,
measured by AT1121 survey meter, into an effective dose to facilitate follow-up evaluation of the helper's dose.

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