PROBLEM TO BE SOLVED: To measure the distribution coefficient and the like of stratum in underground environment by using a boring hole and others. SOLUTION: In a boring hole underground, a stratum environment assessment device loading a stratum assessment sensor 20, a pump 14, a measuring system 7, a PC 8 and a data transmitter is provided. The stratum evaluation sensor 20 is constituted of a thin layer on a ground surface. Underground water mixed by a tracer 14 is sent to the sensor 20, the concentration variation of the tracer in underground water before and after contact to the ground 3 is measured with an analyzer 7. The PC 8 calculates a breakthrough curve from the concentration variation, and measures the distribution coefficient (Kd) of the ground 3 and underground water and an effective diffusion coefficient. COPYRIGHT: (C)2006,JPO&NCIPI
