Speaker
Dr
Kazuhiro Nakazawa
(Department of High Energy Astrophysics, ISAS/JAXA, Japan)
Description
Compton cameras are the most promising approach for gamma-ray
detection from several tens keV to several MeV. High energy
resolution and position resolution are of particular importance to
obtain high angular resolution, and hence clear images. We are
developing new Compton cameras using Si and CdTe semiconductor
position-sensitive detectors. Si is suitable for a scatterer
because
it has high Compton scattering efficiency below 1 MeV, and CdTe is
appropriate for an absorber with its high photo-electric absorption
efficiency.
Here, we will demonstrate the results obtained with our
prototype compton camera. The Compton camera consists of six
layers
of Si Strip detectors, and CdTe pixel detectors. Low noise
analogue
ASICs, VA32TAs are utilized to read out signals from the detectors.
We obtained Compton-reconstructed images and spectra of line gamma-
rays from 81 keV to 662 keV. An angular resolution of several
degrees is obtained when we reconstructed Compton scattering
events.
The energy resolution is 9.1 keV and 18 keV at 356 keV and 511 keV,
respectively. In this presentation, the most recent prototype of
Compton cameras combined with scintillators for anti-shields will
also be addressed.
Primary author
Dr
Kousuke Oonuki
(ISAS/JAXA Japan)
Co-author
Dr
Kazuhiro Nakazawa
(Department of High Energy Astrophysics, ISAS/JAXA, Japan)
