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We have developed an Electron Tracking Compton Camera (ETCC), which providesa well-defined Point Spread Function (PSF) by reconstructing a direction ofeach gamma as a point and realizes simultaneous measurement of brightness andspectrum of MeV gamma-rays for the first time. Here, we present the results ofour on-site pilot gamma-imaging-spectroscopy with ETCC at three contaminatedlocations in the vicinity of the Fukushima Daiichi Nuclear Power Plants inJapan in 2014. The obtained distribution of brightness (or emissivity) withremote-sensing observations is unambiguously converted into the dosedistribution. We confirm that the dose distribution is consistent with the onetaken by conventional mapping measurements with a dosimeter physically placedat each grid point. Furthermore, its imaging spectroscopy, boosted byCompton-edge-free spectra, reveals complex radioactive features in aquantitative manner around each individual target point in thebackground-dominated environment. Notably, we successfully identify a "microhot spot" of residual caesium contamination even in an already decontaminatedarea. These results show that the ETCC performs exactly as the geometricaloptics predicts, demonstrates its versatility in the field radiationmeasurement, and reveals potentials for application in many fields, includingthe nuclear industry, medical field, and astronomy.

First On-Site True Gamma-Ray Imaging-Spectroscopy of Contamination near Fukushima Plant