4π液闪符合绝对测量自动化装置的研制

4π Liquid Scintillation Coincidence Absolute Measurement Automatic System

用4π符合方法测量放射性核素的活度仍是目前国内外基本的测量手段,一些计量单位都建有类似的装置作为其国家放射性活度测量的基准装置。这种基准装置一般是指符合测量装置,它有着很多优点,但也有制源困难、无法克服源的自吸收和膜吸收等缺点。通过与液闪技术结合,建立的4π液闪符合绝对测量装置,可以很好地弥补这些不足,且很容易实现数据的自动获取和处理。该装置可绝对测量纯α衰变、纯β衰变、α-γ衰变和β-γ衰变核素以及X-γ衰变核素的放射性活度,且具有很高的精确度。

The 4π coincidence method is one of the most commonly used methods in the world, some metrology laboratories have set up some similar systems for standardization. It is 4πβ（PC） -γcoincidence system with some excellence. However, it is difficult with the preparation of thin films of VYNS resin for 4πbeta - count- ing, overcoming self - absorption and the VYNS films absorption etc. When the technique is combined with the liquid scintillation technique, the deficiencies can be clear up, It can automatically capture and process the data. It can absolutely detect the radioactivity of pure α nuclides, pure β nuclides, α - γ nuclides, β - γnu- clides and X -γnuclides with a relatively high level of accuracy.