During a PET scan, the patient is injected with radioactive tracer molecules that emit positrons when they decay.
正电子断层扫描仪进行人体扫描的时候，病人被注入正电子放射性核素，然后推入检测环。
The renal parenchymal ROI: drawing a closed curve excluding the renal pelvis detentioned the radioactive tracer.
肾实质ROI：沿肾皮质外缘亦勾画一个闭合的曲线，不包括有示踪剂滞留的肾盂。
The researchers used a radioactive tracer to be sure that the slugs are actually producing the chlorophyll themselves, as opposed to just stealing the ready-made pigment from algae.
研究人员利用放射性示踪法确定，这种海蛞蝓确实能自己产生叶绿素，而不仅仅是从海藻那里偷取现成的色素。
The multiple tracer approach addresses the complexities of transport at the site and differentiates various municipal, industrial and radioactive waste sources.
多重示踪方法可解决当地运移的复杂性，并可区分各种城市的、工业的和放射性的废物的来源。
The multiple tracer approach addresses the complexities of transport at the site and differentiates various municipal, industrial and radioactive waste sources.
多重示踪方法可解决当地运移的复杂性，并可区分各种城市的、工业的和放射性的废物的来源。
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