... radioactivity standard 放射性标准 ; 放射性标准源 Discovering Radioactivity 揭示放射现象 contained radioactivity 密封放射性 ...
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包装好的食品不可能受到放射性污染；例如，罐装食品或者塑料包装食品，只要这些食品是密封的，便不会受放射性污染。
Radioactivity cannot contaminate food that is packaged; for example, tinned or plastic-wrapped food is protected from radioactivity as long as the food is sealed.
近接治疗是将密封性放射性射源借由组织插种或植入病人体腔的方式，在短距离的情况下给予肿瘤高剂量。
Brachytherapy is a method of treatment in which sealed radioactive sources are used to deliver radiation at a short distance by interstitial, intracavitary.
在一个实施方式中，近距离放射治疗植入粒子包括其内容纳有放射性核的密封无机金属圆筒。
In one implementation, a brachytherapy implant seed includes a sealed inorganic metallic cylinder having a radioactive core received therein.
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