A radiation detection device was installed in the lanes of a highway toll station, radioactive rays which was collimated emitted through the measured , and arrivaled the detector. The average density of the resh agricultural products belonged to Green channel and other prohibited items vary greatly, the absorption of radiation are diffemet between the Green Channel Cargo and other substances . Prior to the experimental group, different standardt samples which represent different models and goods were measured, the different standard samples were stored in a computer database. When the trucks get through the Green Channel, the detector will detect the radiation signal and bring to the computer, the computer will process the measured data , and make a conclusion whether the goods are Green Channel cargo.%在高速公路收费站某条车道两侧,安装一套射线探测装置,放射源射出的射线经准直后穿透被测货车到达探测器.一般绿色通道的鲜活农产品的平均密度与其他违禁物品差别较大,绿通货物对射线的吸收与其他物质不同.事先根据实验进行分组,对不同的车型和货物成分进行标准样的测量,并在计算机中存储不同标样的数据库.探测器将穿透货物的射线信号转换成脉冲信号,送到工控机进行信号处理,工控机对测得数据进行处理和分析后可自动测量出货物是否为绿通货物.
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