Superfine photon-counting detector for 0.1-100 keV X-ray imaging

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We report on a new photon-counting detector possessing unprecedented spatial resolution, moderate spectral resolution and high background-rejection capability for 0.1 - 100 keV X-rays. It consists of an X-ray charge-coupled device (CCD) and scintillator. The scintillator is directly deposited on the back surface 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 pass through the CCD but can be detected in the scintillator, generating visible lights there. Since CCDs have a moderate detection efficiency for visible lights, they can again be absorbed by the CCD. We coupled the needlelike CsI(Tl) on the front surface of the back-illuminated (BI) CCD. High detection efficiency for visible lights of the BI CCD enables to collect the lights emitted from CsI(Tl) efficiently, leading to the moderate spectral resolution of 25% at 59.5 keV. We also investigated the imaging capability of our device and found it to be (10+/-3)µm at 17.4 keV.

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