Abstract：Research purposes: The research is made on the methods of testing，analyzing, calculating and determining anomaly of radioactivity in railway construction and the preventive threshold values and measures are proposed for anomaly of radioactivity.
Research methods: In combination with the features of engineering and man's action the numerical calculation is adopted for analyzing and determining anomaly of radioactivity based on comparison with the preventive standards for radioactivity.
Research results: The methods are offered for calculation and determination of radioactivity dosage in railway station, living area, normal railway section and tunnel construction, and the preventive threshold values and measures are presented for radioactive radiation anomaly.
Research Conclusions: For prevention of radioactive radiation in railway construction, the influence degree of radioactivity should be evaluated on the basis of learning the radiation degree and features of its distribution. The railway should bypass those areas in which anomaly of radioactivity exist in most locations when selecting railway route. For those locations with anomaly of radioactivity above the threshold value, the preventive measure should be taken according to the different conditions of each construction.
2006, Vol. 23 
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