ATMOSPHERIC PROTON MICROPROBE FOR TRACE ELEMENT ANALYSIS

描述：(改编自申请者的摘要)这是一个阶段 II关于发展扫描质子微探针(SPM)的建议 利用质子诱导X射线发射(PIXE)探测和测绘 生物样品中微量元素的分布。这台仪器是 基于产生1.5 MeV的低能量静电加速器 用于样品在真空或高温下的微探针分析的质子束 大气压。该仪器旨在用来检测元素 原子序数&gt；10，具有ppm灵敏度。设计了一种新的仪器 在大气压下的空间分辨率为5微米，在大气压下的空间分辨率为1微米 真空样品。试件的热损伤应通过快速 扫描光束。

DESCRIPTION: (Adapted from the applicant's abstract) This is a Phase II proposal for the development of a scanning proton microprobe (SPM) using proton-induced x-ray emission (PIXE) for detection and mapping of trace element distributions in biological samples. The instrument is based on a low-energy electrostatic accelerator producing a 1.5 MeV proton beam for microprobe analysis of samples either in vacuum or at atmospheric pressure. The instrument is intended to detect elements with atomic numbers > 10 with ppm sensitivity. The instrument is designed to have spatial resolution of 5um at atmospheric pressure and 1um for vacuum samples. Thermal damage of samples is to be minimized by rapid scanning of the beam.