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首页> 美国政府科技报告 >Application of Neutron Activation and High Resolution X-Ray Spectrometry to the Development of Analytical Methods Suitable for the Assay of Trace Elements in Biological Materials. Part of a Coordinated Programme on Comparative Met
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Application of Neutron Activation and High Resolution X-Ray Spectrometry to the Development of Analytical Methods Suitable for the Assay of Trace Elements in Biological Materials. Part of a Coordinated Programme on Comparative Met

机译：中子活化和高分辨率X射线光谱法在开发适用于生物材料中微量元素分析的分析方法中的应用。比较气质协调计划的一部分

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A new method for determining trace elements in biological materials by instrumental neutron activation analysis (INAA) has been investigated. This method is based on the measurement of low-energy X-rays emitted by the sample after appropriate activation with thermal neutrons. The X-rays were detected by a Si(Li) diode connected to a multichannel analyser. The background in the energy region of interest was reduced by means of an electromagnet which deflects high-energy beta-particles away from the detector. This method of measurement has been evaluated by application to a number of different biological reference materials. The use of the electromagnet for background reduction was shown to be extremely effective for several radionuclides that are common sources of disturbance in INAA. For exp 32 P the background was only 0.8% of its original value. For real samples the background reduction depends somewhat on the matrix and therefore varies from one material to another. Practical detection limits for typical biological materials were derived for 18 different trace elements. The use of a perspex absorber was also considered as an alternative to magnetic deflection of the beta rays. In practice, magnetic deflection is preferable for the lower-energy X-ray emitters such as the activation products of Co, Cr, Cu and Zn. (Atomindex citation 12:626437)

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