核素

This paper describes the principle and application of correlation method in the absolute radioactivity measurement .

本文介绍用于放射性核素活度绝对测量的相关方法的基本原理、应用及其优点。

In the end of the paper, simulating the different energy gamma photons response through the nude NaI crystal detector and getting the response in 137Cs window from the different kinds of radionuclide, such as the response of 238U、 232Th、 40K and 137Cs itself in 137Cs window, getting the response in NaI multi-channel gamma spectrum from different nuclides.

本论文是利用蒙特卡罗方法模拟伽玛光子在NaI多道伽玛能谱响应，本论文介绍了蒙特卡罗方法以及该方法在核物理的应用，介绍了蒙特卡罗方法在计算机中的实现以及一种应用软件—MCNP—4B，最后具体模拟不同能量的伽玛光子在裸晶体NaI中的响应，得到NaI多道伽玛能数据中~(137)Cs窗中天然放射性核素，如~(238)U、~(232)Th、~(40)K，以及~(137)Cs本身在~(137)Cs窗中的响应，得出~(238)U、~(232)Th、~(40)K、~(137)Cs的响应函数。

One of the benefits of co-locating a cyclotron and a scanner is the being able to produce and use short lived isotopes

对于回旋加速器和断层扫描的协同定位，其优点是能够生产和使用短寿命核素。

In this study, for the complicated distribution of dose rate in time and space, considering the repair of the sub-death cells, the radionuclide decay law and exponential proliferation of clonogenic cells, the dose-response relationship is built based on the known linear-quadratic model, and the concept of tumor control probability is introduced into the therapy method. Furthermore, the concepts about "curable stage" and "critical time point" and the methods calculating the amount of radionuclide injected into tumor in clinical are proposed.

本课题针对这一方法中靶区复杂的剂量率时-空分布特点，以公认的"线性-二次模型"理论为基础，同时考虑亚致死性细胞修复、核素衰变规律和克隆原性细胞指数增殖，建立了适合这一治疗方法的具有时-空分布特点的剂量效应关系，并进一步将肿瘤控制概率的概念引入这一方法中，提出了"治愈期"及"临界时间点"的概念以及由此指导临床确定药物注射剂量的方法。

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。

Environmental treatment and monitoring must be done after decommission of uranium mill tailing impoundment.

铀尾矿库退役后要进行环境治理和长期监测，对库中放射性核素进行模拟可以为放射性废物安全管理提供科学依据。

The dose-effect is relatively ideal,and the HPRT gene mutation can be taken as a radiation biological dosimeter.

克隆法是一种检测放射性核素内、外照射诱发HPRT基因突变的方法，HPRI，基因突变剂量效应关系理想，有可能作为辐射生物剂量计。

The coulomb excitation studies of the exotic nuclei around the double magic (superscript 28 subscript 28)Ni50 at RIBLL are proposed.

提出了利用兰州放射性束流线开展双幻核(上标 78 下标 28)Ni50附近核素的低位能级核结构研究的构想。

From April 2000 to March 2001 85 patients with nasopharyngeal carcinoma were divided into group of radiation alone and group of radiation+GSBG.(superscript 99m)Tcpertechnetate was used to assess trapping and excretion function of dual parotid gland of both group's patients before radiation therapy and at dose point of 60 Gy,(count according 2 opposed lateral field), and during radiation therapy subjective symptom and physical sign (cavity mucous membrane reaction) were observed.

从2000年4月－2001年3月将85例鼻咽癌随机分为两组：单纯放疗组和放疗加黄芩酚性苷类组，分别在放疗前和两侧对穿野放疗至60Gy时以(上标 99m)锝核素扫描检测腮腺的摄取和排泌功能，同时每周观察患者的口干症状和口腔黏膜反应。

The method needs several parameters, such as average fission yields of fission products, correction for reaction, decay correction for radlioactive fission products in reactor, average fission energies of fissionable nuclides and so on.

它需要若干参数，如裂变产物的平均裂变产额，反应的修正量，放射性裂变产物的堆内衰变修正量，可裂变核素的平均裂变能量等。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。