走航式海洋放射性物质探测仪试验与应用初探

Preliminary study on experiment and application of navigational marine radioactive material detector

走航式海洋放射性物质探测是一种高效、经济的海洋地球物理勘探方法,其应用范围包括海洋环境放射性污染监测、海洋地质矿产勘查以及海洋工程地质调查等。本试验的探测器由大体积碘化钠晶体(5R5)、前置放大器、数字化谱仪以及减压缓震材料等部件组成;配套软件功能齐全,操作简便、智能。室内稳定性测试、分辨力测试、铯-137源测试、海上现场试验结果表明,该探测仪性能稳定、能量分辨力高、灵敏度高。此外,初步试验结果表明,探测仪对不同物质的响应有明显的差异,能够根据其探测结果对物质进行放射性分类,对海底沉积物的分类研究也有很大的应用前景。

The navigational radioactivity measurement in seawater or on seafloor sediments is an efficient and economic method for geophysical exploration. This detector can be applied in fields such as marine radioactive pollution monitoring,marine geology,mineral exploration and the alike. The detector tested in this paper consists of sodium iodide,pre-amplifier,digitizing spectrometer and the decompression and shock retarding materials. The bundled software includes the basic functions for geophysical investigation and it is user-friendly. On the basis of systematic tests including stability test,resolution test and calibration source test in the laboratory,the fixed point tests at wharf,on the sea and sailing measurement in the sea,it shows that the detector has the advantages of steady performance,high energy resolution and high sensitivity. Furthermore,the tests also show that the detector is able to distinguish the radioactivity of many substances. It means that we can classify the substances from the measurements. This is meaningful for further study of classification of marine sediments.