HXS consists of a NaI(Tl) scintillator (7.6 cm in diameter and 2.5 cm in
thickness). The window of NaI scintillator is covered with two kinds of
stainless steel absorbers of 13.8 cm
0.08 mm thickness and 31.8
cm 1 mm thickness to suppress low-energy X-rays associated with
solar flares.
HXS covers the photon energy band from 20 keV to 650 keV (1991 Oct. 1 - 1992 June 9) and from 24 keV to 830 keV (1992 June 9 - present). The energy resolution is 26 % at 22 keV and 13 % at 88 keV. Inflight energy calibration is achieved by detection of the 60 keV line emitted by an Am-241 radioactive source. In addition, the 191 keV line emitted by radioactive I-123 and the 511 keV line emitted by positron annihilation are used for inflight energy calibration.
HXS has two PC channels PC1 and PC2, and a 128-channel PH. The energy bands of PC1, PC2 and PH are given in the table in section 4.5.
The HXS instrument calibrations are stored in the following data files located in the directory $DIR_WBS_CAL (/ys/wbs/response) and in IDL programs.
