放射性半衰期

~（252）Cf放射性衰变半衰期的测量

Determination of disintegration half - life of ~ ( 252 ) Cf

我们不知道砹看上去是什么样子的，正如劳维所说：“这玩意儿根本就是不想存在。”砹具有极强的放射性（半衰期以小时计算），任何一块稍微大一点儿的砹块都会被自身衰变释放出来的热量气化掉。

We don 't know what astatine looks like , because , as Lowe put it , " that stuff just doesn 't want to exist . " It 's so radioactive ( with a half-life measured in hours ) that any large piece of it would be quickly vaporized by its own heat .

用量子隧道效应计算α放射性元素的半衰期

Calculating the Half - life of α Decay with Quantum Tunneling Effect

半导体射线敏感元件放射性物质的半衰期

Semiconductor radiation sensitive element

而剩下的那些元素，不是太具有放射性，就是半衰期太短，一次最多只能获得几个分子。

The rest are too radioactive or short-lived to collect more than a few atoms of them at once .

我们可以谈论放射性同位素的半衰期，我们确实可以非常准确地测量和描述半衰期是什么。

We can talk about the half-life of a radioactive isotope , and indeed we can measure and state very very precisely what that half-life is .

放射性绝对测量和半衰期（Ⅳ）&N0的应用和准确度

MEASUREMENT OF NUMBER OF RADIOACTIVE ATOMS AND HALF-LIFE (ⅳ) & Applications and Accuracy of N_0

在放射治疗的全程中放射性核素和载体的结合是不可逆的，这种结合由放射性核素的物理半衰期决定。

The binding between the radionuclide and the vehicle should be irreversible throughout the course of the radiotherapy , which , in turn , is determined by the physical half-life of the radionuclide ;