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射线穿过不同物质后，物质对射线吸收的程度可用放射性密度－含水率计来测定。不同矿化度的流体，其离子浓度不同，因而对射线吸收的程度不一样。矿化度试验发现，当在蒸馏水中加盐使矿化度达到８００００ｍｇ／ｋｇ时，密度变化值为０．０４ｇ／ｃｍ２，含水率变化值为２．４％。大庆地区的地下水一般属ＮａＨＣＯ３水型。当矿化度为２０００～６０００ｍｇ／ｋｇ时，其计数率变化不大。建议今后在当地地层水的矿化度范围内对仪器进行刻度标定，这样就可以忽略矿化度对仪器响应的影响。
Radiation through different substances, the degree of material absorption of radiation available radioactive density - moisture meter to determine. Different salinity of the fluid, the ion concentration is different, so the degree of absorption of radiation is not the same. The salinity test found that the density change was 0.04 g / cm2 and the change in water content was 2.4% when salt was added to distilled water to bring the degree of mineralization to 80,000 mg / kg. Groundwater in Daqing is generally a type of NaHCO3 water. When the salinity of 2000 ~ 6000mg / kg, its count rate changed little. It is suggested that calibration be performed on the instrument within the salinity of the local formation water in the future so that the influence of salinity on the response of the instrument can be ignored.