放射性衰变

Intelligent nuclear instrument has been a dominant developing direction of radioactivity measurement instrument. The instrument for radon measurement of air pulse ionization chamber, based on the theory that alpha rays decayed by radon and its progeny can ionize the air molecules, can measure the radon concentration accurately.

智能核仪器已成为放射性测量仪器发展的一个主导方向，利用氡及其子体衰变放出α射线能使空气分子电离的理论设计的空气脉冲电离室α测氡仪可以准确地测量空气中的氡浓度。

The radioactive transformation giving rise to these electrons was known as beta decay.

产生这种电子的放射性变化，称为β衰变。

A better idea springs from the weak force , which governs certain nuclear processes, including radioactive beta decay. In 1964, physicists found that the weak force is not quite symmetrical in its dealings with matter and antimatter, resulting in something known as CP violation .

比较好的意见是后来突然提出来的称为"弱力"的理论，这种"弱力"控制了某些核过程，其中也包括了放射性的β衰变。1964年，物理学家发现弱力在处理物质和反物质是不完全对称的，此种结果称为宇称不守恒。

The core of this model is a function called a stretched exponential relaxation, which is similar to the decay curve of a radioactive material.

这个模型的核心是延伸型指数函数的松弛效应，就像放射性物质的衰变曲线一样。

It is major work to present the tectonic time duration system of the strain rate method, which is an original exploration.(1) Principle: Its basis is the stress and strain rule depending on strain capacity in steady-state stress field, but not the radioactive decay law depending on radiation dose in invariable radiation field. This can be simplified as a process of differential stress-strain rate-strain capacity-time duration calculating.

工作重点是梳理出应变速率法构造时限定年系统，属原创性探索：①原理：不是基于放射性核素衰变规律，而是基于应力应变规律；不取决于恒定辐射场的辐射剂量，而取决于稳态应变场的应变量，可简括为差异应力-应变速率-应变值量-计算时限的求索过程。

Any of several radioactive gases that are isotope s of radon and are products of radioactive decay.

"几种氡的同位素的放射性气体，是放射性物质衰变的产物。"

Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

"几种氡的同位素的放射性气体，是放射性物质衰变的产物。"

A radioactive isotope gradually loses its radioactivity and decays over time into the normal form of the substance.

放射性同位素逐渐丧失放射性，并逐渐衰变成该物质的正常形式。

Radon is the crust of rock, soil radioelement arising from the decay of a radioactive inert gases, which are mainly the lungs and bronchial have on the human body radiation.

氡是地壳岩石、土壤中放射性元素衰变而产生的一种放射性惰性气体，它主要是对人体的肺和支气管产生辐射作用。

Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.

&几种氡的同位素的放射性气体，是放射性物质衰变的产物。&

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。