|
Summary of Research Projects (Supports in 2003
Fiscal Year)
| Subjects |
Study of the wide-band capability of the X-ray CCD
by deposition of scintillator |
| Representative researcher |
Osaka University Emi MIYATA |
| Joint researcher |
Osaka University Hiroshi TSUNEMI |
| We report a new photon-counting
detector for 0.1-100 keV X-rays. It consists of an X-ray charge-coupled
device (CCD)
and a scintillator. The scintillator is directly deposited on the backside
of the X-ray CCD. Low energy X-rays below 10 keV can be directly detected
in the CCD. The majority of hard X-rays above 10 keV passes through the
CCD but can be absorbed in the scintillator, generating visible photons
there. Since CCDs have moderate detection efficiency for visible light,
visible light can be absorbed by the same CCD. We developed a method of
direct deposition of CsI(Tl) forming a needlelike structure on the CCD
and succeeded in fabricating the CsI(Tl) deposited CCD (SD-CCD). We investigated
the spectral capabilities of our device with 109Cd and 241Am.
We found that the lateral spread of visible light emitted from needlelike
CsI(Tl)
was so large that the pulse height of pixels was not significant compared
with the noise level. We then operated the SD-CCD in the on-chip binning
mode and investigated its spectral and imaging capabilities. The energy
resolution of the SD-CCD was 52±1% and 42±2% at 22.1 and
59.5 keV, respectively. The spatial resolution can be achieved 10mm at
17.4 keV. |
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