![1-30](img/honbun/e2019_L1-30.jpg)
Fig.1-30 Measuring the gamma-ray spectra of surface sediment
(a) The contribution ratio of direct gamma rays emitted from radiocesium was high when radiocesium was emitted from the surface-layer sediment. (b) The contribution ratio of scattered gamma rays was high when radiocesium was emitted from deeper-layer sediment because the emitted gamma rays were shielded by soil particles. (c) Relationship between RPC obtained by in-situ measurement and βeff obtained by sediment sampling.
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