Underground thorium burial exploration device and method

摘要

The present invention provides an exploration device / method for exploring whether or not thorium is buried in the ground without considering the influence of background on the ground surface. SOLUTION: A search apparatus 100 of the present invention is a first radiation shield that covers the periphery of (a) two adjacent radiation detectors 2 and 3 and (b) a detection unit 4 of one radiation detector 2. 6 and (c) a second radiation shield 7 covering the periphery excluding the front surface 8 of the detection unit 2 of the other radiation detector 3, and (d) two γ-rays measured by the two radiation detectors And processing means 12 for determining the difference of the spectra (counts). [Selected figure] Figure 1