Studying Of Field Gamma-ray Full Spectrometric Surveying

This paper is finished on the basis of scientific studying items 揝tudying of field gamma-ray full spectrometric survey technology and application?and 揇emonstrative studying of nuclear method full spectrometric surveying quick analysis technology? Base on literature search, the paper analyzed the overseas and intestine instruments and methods, that were relate to field gamma ray full spectrometry. The some problems are indicated. (1) In general, four channels gamma ray spectrometer is used in field gamma spectrometric surveying. The instrument only made used of the gamma ray about bigger than 1 000keV, which was used to determine contents of uranium, thorium and potassium. It is cast off that abundant information of about 80% gamma ray spectrum. (2) In recent years, although multichannels (more than 256) gamma ray spectrometer has been made overseas, field gamma ray spectrometric survey is only used to determine contents of uranium, thorium and potassium, by reason of applying gamma ray spectrometry later than developing instruments, can't obtaining full spectrum because of the problem of stabilizing gamma ray spectrometric peaks, and it is impercipient for field gamma ray spectrometry. It is important that studying gamma ray spectrometry of field rocks and soil in the earth抯 crust. Their energy range are mainly 30-3000keV, they contain abundant information of natural radioactive nuclides, such as uranium, thorium, potassium, etc, and of artificial radioactive nuclides from nuclear engineering activity, such as cesium, americium, cobalt, etc, and of the results in interaction between gamma ray and earth抯 crust. Detecting 30-3000keV's gamma ray is based on field gamma ray spectrometric surveying. It is proved that field scintillation gamma ray spectrometer must have 1000 channels analysis precision. It is necessary that developing new instrument for field gamma ray spectrometry. There are follows of characteristic when the studying results compared with existing field gamma ray spectrometer. (1) In theory, the concept of field gamma ray full spectrometry is established, in practice, the technology of field gamma ray spectrometric surveying is achieved. We utilized the virtual instrumental technology, have developed 1024 channels field gamma ray spectrometer. It can be used to quick obtain gamma ray full spectrum in situ. The instrument has provided the new equipment for field gamma ray spectrometric surveying in our country. (2) It has succeeded in the technology of stabilizing gamma ray spectrometric peaks. It is not used to radioactive nuclide. It makes the most of the predominance in multichannels analyzer and microcomputer, achieves stabilizing spectrum by computer software. (3) Field gamma ray spectrometry has been betimes applied to geological filling, mines prospecting, nuclear engineering environment monitoring, and so on. It is necessary of development in west part of our country. The studying results have been used for our country production and scientific research.