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由杭州机械设计研究所与江苏省国营海安电子仪器厂共同研制的ND-50表面型微机核子密度仪于1988年12月21日在杭州通过部级技术鉴定。这次鉴定会由能源部科技司主持召开。能源部等有关单位的代表出席了会议。 ND-50仪是利用γ射线透射法和反散射法对密度进行测量的。容重测量范围为1500～2700kg/m~3,最大测量深度为50cm,突破了国外同类仪器最大测量深度为30cm的限度。仪器使用微处理机控制和处理数据,有十三种功能,其测量和计算的数据直读并可存贮打
The ND-50 surface-type computerized nuclear densitometer jointly developed by Hangzhou Mechanical Design Institute and Jiangsu Haian Electronic Instrument Factory passed the ministry-level technical appraisal in Hangzhou on December 21, The appraisal will be held by the Department of Science and Technology Department of Energy. Energy and other related units attended the meeting. ND-50 instrument is the use of γ-ray transmission method and the backscatter method to measure the density. Bulk density measurement range of 1500 ~ 2700kg / m ~ 3, the maximum measurement depth of 50cm, breaking the maximum measurement of foreign instruments of the same limit of 30cm. The instrument uses microprocessors to control and process the data, with thirteen functions for direct reading and calculation of measured and calculated data