放射性的

The crystal-chemical properties and the genesis of the allanite have been disscussed, in addition, the radioative decay of Th and U and the oxidation cause rare-earth elements to be released from its lattice to d...

认为本区的褐帘石是部分变生的。变生的机理是因为其晶格中含放射性元素U，Th高，且这与褐帘石的选矿性能有重要关系。

Measurement of gamma ray activities can be transformed to that of alpha ray and beta ray activities. When natural radionuclides are well distributed in materials, there is fixed interrelationship between alpha ray and beta ray activities in any part of a decorative material and alpha ray and beta ray surface activities.

同时，ICRP和IAEA都已明确我国《放射卫生防护基本标准》GB4792-1984对公众的剂量限值不适用于天然放射性，而我们的国家标准仍使用土壤的剂量转换因子和公众的年剂量限值来推导建筑材料的核素限量。

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。

Relatively lightweight aluminium or plastic shielding can block charged particles from the sun. But it would take impractically thick and heavy shields to stop the higher-energy galactic cosmic rays.

轻重量铝或塑料隔离罩能够阻挡来自太阳的带电放射性粒子，但是厚重的隔离板阻挡高能量宇宙放射线是不切合实际的。

As high radioactive materials may exist in different lithologies, so when using the general natural gamma log in the exploration of reservoir, there may be some extent errors.

由于高放射性物质可能存在于不同的岩性当中，因此，采用常规的自然伽马测井在储层解释当中可能会带来一定的误差。

Objective To establish a new,simple and noninvasive method which can quantitatively analyze the colonic transit function by dual radionuclide colon scintigraphy.

目的 建立一种新的、无创性的放射性核素定量检测结肠运动功能的方法。

Advantageous physical and chemical characteristics, the highly purified and ultra-fine fused spherical quartz powders (spherical silica powder—SSP) become indispensable for packing and sealing materials in LSI and SLSI. The actuality of research and development of SSP in China is studied and the international situation of production is also introduced briefly.

高纯超细熔融球形石英粉由于具有高纯度、高耐热、高耐湿性、高可靠性、高填充量、低粘度、低放射性、低应力、低膨胀、低摩擦系数等优越的物理化学性能，在大规模、超大规模集成电路的基板和封装料中，成了不可缺少的优质材料。

A unique copper target design for production of radioactive 〓Zn is presented and it thermal property is tested.

靶材料的研究制备以及放射性核素的释放都是需要解决的关键技术问题。

The ure process was found to have a good decontamination efficiency, its d.f. reaching 3.2×103.the results of the low-level radioactive waste water.

由&三膜&组合工艺组成的ure流程去污因子高达3.2×103，为放射性废水的处理提供了一种新的方法。

Succeful seismic testing for Flowserve valves The multiple radiation waste remediation projects in, which the valves will be utilised, will eure that nuclear waste can be safely stored while the isotopes decay and eventually become harmle.

福斯流体控制有限公司福斯阀门成功用于地震测试那些大量用于放射性废物补救设备中的阀门，可以确保核废料安全的储存在同位素中，减弱核辐射并最终变的无害。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。