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The major difference between the two is that instead of a positron-emitting substance, SPECT uses a radioactive tracer that emits high-energy photons. 这两种技术最大的区别在于，单光子发射计算机化成像不用发射正电子的物质，而是用一个能发出高能量光子的有放射性的跟踪剂。
The major difference between the two is that instead of a positron-emitting substance,SPECT uses a radioactive tracer that emits high-energy photons. 这两种技术最大的区别在于，单光子发射计算机化成像不用发射正电子的物质，而是用一个能发出高能量光子的有放射性的跟踪剂。
When they reached a transcendental high, they were asked to pull a kite string to their right, releasing an injection of a radioactive tracer. 当他们达到超越的高度，他们被要求去拉一条风筝线到他们的右侧，释放放射性追踪器的注射剂。
A radioactive tracer. 放射性追踪剂
A radioactive isotope of carbon, especially carbon 14. 放射性碳碳的一种放射性同位素，尤指碳14。
Radium is a radioactive element. 镭是个放射性元素。
an inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction. 一种惰性物质，是同类物质放射示踪物的载体，经化学反应痊愈后具有抵抗性。
The intensity of a radioactive source. 放射性放射原的强度
A radioactive isotope of iodine widely used as a tracer in medical diagnosis. 放射性碘碘的一种放射性同位素，广泛地用于医学诊断作为追踪剂
A radioactive compound used in radiotherapy or diagnosis. 放射性药剂一种用于放射性治疗或诊断的放射性化合物
The rectified de background clearance curves obtained using 133 Xe as radioactive tracer were similar to those obtained using 99m Tc as tracer. 用吸入133Xe示踪剂法得到的G负荷去本底清除曲线，经校正后，与用注射99mTc法测得的G负荷血容曲线很相似。
The chemical tracer, especially the perfluorocarbon tracer and sulphur hexafluoride, has been used much more popularly than the radioactive tracer nowadays. 化学示踪剂已取代放射性示踪剂在混相驱中的主导地位，其中，全氟环烷烃和六氟化硫是目前现场广泛试验和应用的化学气体示踪剂。
A radioactive isotope of thorium with mass number228. 射钍钍的放射性同位，质量数为
A radioactive, inert, gaseous isotope of radon, with a half-life of 3.92 seconds. 锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3.;92秒
A stream of particles or electromagnetic waves emitted by the atoms and molecules of a radioactive substance as a result of nuclear decay. 核衰变产生的微粒或电磁波放射物的原子或分子由于核衰变放出的一束微粒或电磁波
The use of radioactive tracers to study biological processes. 用放射性追踪的使用来研究生物进程。
The residual nucleus will, in general, undergo a radioactive transformation. 剩余核一般说来将发生一次放射性衰变。
Caesium-137 is a radioactive isotope, formed mainly through nuclear fission. 铯-137是一种放射性同位素，主要由核分裂产生。
A radioactive particle moving in a blood stream causes transient changes of dose rate near its path. 当一个放射性物质在血流中移动时在它的路径附近引起剂量率的瞬间变化。
The decomposition of a radioactive element is the simplest example of a true first order reaction. 放射性元素的衰变是真正一级反应最简单的实例。