問題詳情
6. 有一胸腔 X 光室(Chest room)，每星期 250 人次的胸腔 X 光攝影，在主射束前方 1 公尺處，每人次平均無屏蔽的空氣克馬(the mean unshielding air kerma per patient)等於 1.2mGy patient-1，X 光管到主屏蔽牆的垂直距離為 3 公尺。牆外為非管制區，其空氣克馬率限值採用 0.02 mGy wk-1，佔用因數採用 1，請求出主屏蔽的鉛當量厚度(mm)為何？
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