Comparison and analysis of environmental γ-radiation levels by using different monitoring methods

Objective: To discuss the results of terrestrial γ radiation using different monitoring methods. Methods: Five environmental monitoring points and two supervisory monitoring points were selected, and results of γ dose rates from the automatic continuous monitoring (ACM), instantaneous monitoring (IM) and cumulative monitoring (CM) during 2010-2014 were compared. Results: The results at same point showed that γ dose rates monitored by the ACM were the largest, those of the CM were the second, and those of the IM were the smallest. For the same point in the five years, the standard deviations were 0.62 ∼ 6.96 nSv/h and 4.95 ∼ 28.11 nSv/h by using the same and different monitoring methods, respectively. Conclusion: To a certain extent it has been proved that the terrestrial γ radiation monitored by the three methods is scientific and comparable. It is able to guarantee the quality of monitoring data, and it is of great significance to optimize monitoring points in the radiation environment. (authors)