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60年代初步进行了室内试验,在此基础上,1978年进行了田间实验设备的研究,并改进了室内试验设备,试验表明利用伽马透射法测量土壤含水量,其精度约等于或稍低于称重法,但能进行定点观测,不破坏观测条件,测量迅速简便,较之中子法易于防护,本文对影响伽马透射法精度的因素进行了分析,提出了提高观测精度的途径。
In the 1960s, preliminary laboratory experiments were carried out. Based on this, a field experiment equipment was researched in 1978 and indoor laboratory equipment was improved. Experiments show that the accuracy of soil moisture measurement using gamma transmission method is about equal to or slightly lower than Weighing method, but can do fixed point observation without destroying the observation conditions, the measurement is quick and easy, which is easier to defend than the neutron method. In this paper, the factors affecting the accuracy of gamma ray transmission method are analyzed and the ways to improve the observation accuracy are put forward.