X-RAY DIFFRACTIOMETER--RIGAKU, D/MAX-RVBX & PSPC/MDG

本提案是关于采购理学X射线 D/max-B系列和X射线显微镜 衍射单元，以取代一个25岁的X射线衍射仪。 X射线衍射法是一种重要的技术， 这是大多数部门的调查人员所要求的。 机构（物理化学，无机化学， 生物化学，生物工程，龋齿学，牙科材料， 超微结构和组织学）。 这些部门的调查人员 从事以下领域的研究： 羟基-和 氟磷灰石作为生物磷灰石的原型，成矿作用 以及牙齿和骨骼的结构和牙科材料。 有效 解决这些问题需要一个上级 衍射仪，能够高效，定性和定量， 微观分析方法。 拟议的仪器将满足这些需求： B）通过旋转阳极进行对准和数据分析， c）微束衍射技术， 位置敏感正比计数器（PSPC） 高功率 供应将缩短测量时间，提高精度， 测量与计算机的支持，并提供 即使所产生的X射线束 对于微束衍射（10、30和100 μ m in 直径）。 另一个非常重要的问题是， 仪器在安全性方面具有主要优点， 操作员暴露于X射线辐射是可以忽略不计的， 具有联锁装置，可防止操作员意外暴露于 X射线 这些特征在现有的 设备. 许多预期的研究项目涉及 将形态学和组织学特征与 矿化组织的晶体学性质和牙齿 材料. 提出的微束衍射仪将满足 这些需求通过提供PSPC， 衍射强度数据为一个宽范围的20个角度从5 至150：此外，可以获得衍射数据， 使用拟议的仪器，从大量的小区域， 在合理的工作时间内， 一个宝贵的工具，以确定异质性的程度， 标本 基于上述原因，我们坚信， 新设备将是一个非常重要的改进 我们研究所在牙科研究领域的能力。

This proposal is for the acquisition of a Rigaku X-ray diffractometer system, the D/max-B series and X-ray micro diffraction unit, to replace a 25 year-old X-ray diffractometer. X-ray diffractometry is an important technique which is used or required by investigators from most of the departments at this Institution (Physical Chemistry, Inorganic Chemistry, Biochemistry, Bioengineering, Cariology, Dental materials, Ultrastructure and Histology). Investigators in these departments are engaged in research in the following areas: dental cariogenesis, preparation and solubility studies of hydroxy- and fluorapatites as prototypes of biological apatites, mineralization and structure of tooth and bone, and dental materials. Effective work on problems in these areas requires a superior diffractometer, capable of efficient, qualitative and quantitative, and microanalytical approaches. The proposed instrument will meet these needs: a) high intensity supply using a rotating anode, b) alignment and data analysis by a computer, and c) microbeam diffraction techniques with the position sensitive proportional counter (PSPC). The high power supply will shorten the measuring times, improve the accuracy of measurements with a support from the computer, and provide sufficient intensity even if the generated x-ray beam is collimated for the microbeam diffraction (10, 30 and 100 um in diameters). A highly significant further issue is that the proposed instrument has major advantages with respect to safety in that operator exposure to X-radiation is negligible and the instrument has interlocks which prevent accidental exposure of operators to X-radiation. These feature are absent from the existing equipment. A significant number of the anticipated research projects involve correlating morphological and histological features with the crystallographic properties of mineralized tissues and dental materials. The proposed microbeam diffractometer will fulfil these needs by providing PSPC to simultaneously accumulate diffraction intensity data for a wide-range of 20 angles from 5 through 150: In addition, the diffraction data can be obtained, using the proposed instrument, from a large number of small areas in the specimen within reasonable working times, thus providing an invaluable tool to ascertain the degree of heterogeneity of specimens. For the foregoing reasons we strongly believe that the new equipment would constitute a very significant enhancement of our Institute's capabilities in the area of dental research.