Background Gammas (BG) from outward PSF are easily rejected. By imaging rejection, BG is reduced by a factor of 10-2~3.

  • Example spectroscopy of weak RI source.
  • 22Na (27 kBq, 511 keV) with a distance of 5.5 m.
  • 8×10-5 μSv/h at the front of ETCC (1/1000 of Environmental radiation).





Tanimori et. al., ApJ (2015), Tanimori et. al., Scientific Reports (2017)