The 9910 is a wide dynamic range, X-ray counting system.
X-rays up to 100 keV are detected using a scintillator coupled to a photomultiplier and signal processing electronics to provide a TTL output
The detector uses a window discriminator to detect X-rays within a selected energy band. The width and threshold (lower limit) of the window and the HV of the photomultiplier can be set by the user with the 9910 CONTROL.
Fast count rates are achieved by using a YAP(Ce) scintillator, selected for its very fast (30 ns) decay time, and high speed electronics, designed to minimise dead-time.
As well as counting X-rays in a set energy band, the unit can be used to generate an energy spectrum by using a arrow (energy) window and progressively increasing the ower threshold. This feature is also used to calibrate the etector, using gamma and X-ray sources of known energy.
