Ultrahigh resolution radiocesium detection based on Cerenkov light imaging

Yamamoto, Seiichi*; Ogata, Yoshimune*; Kawachi, Naoki; Fujimaki, Shu

Cerenkov light imaging of positron radionuclide has inherently high resolution and is promising for molecular imaging. Since the Cs and Cs emit beta particles, Cerenkov light imaging will be useful for the imaging of the radiocesium distribution. Consequently, we tested the Cerenkov light imaging for radiocesium solution to realize high resolution without contact to the subjects. We used high sensitivity cooled charge coupled device (CCD) camera (Hamamatsu Photonics, ORCA2-ER) for imaging the Cerenkov light. An f=0.95 lens (Xenon 0.95/25) was mounted with the camera and installed in a black box. Approximately 1cc solutions of Cs ( max energy: 0.66 MeV: 70%) and Cs (1.2 MeV: 5%, 0.5 MeV: 95%) (100 kBq each) were imaged with the CCD camera. With 2 min acquisition, the distribution of the Cs and Cs solutions started to be visualized and high resolution images could be obtained with 20-30 min acquisitions. With these results, we conclude that Cerenkov light imaging is promising for high resolution imaging the distribution of Cs and Cs.