Lithium-Drifted Silicon Detectors (Si(Li))




Lithium-Drifted Silicon Detectors (Si(Li))

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Product Summary

Optional light-element capability extends the lower limit to below 185 eV. Both HPGe and Si(Li) detectors are fully temperature-cyclable and may be stored indefinitely at room temperature with no degradation in resolution. The X-ray source can range from nuclear accelerators to secondary X rays generated by fluorescence. X-ray detectors are used extensively for research, quality control, and failure analysis.



  • P-type high-purity germanium (10 and 30 mm2) with very thin entrance layer
  • Lithium-drifted silicon (10, 30, or 60 mm2) with gold metallization entrance layer.
  • Stainless steel endcap with beryllium window of 0.3 or 0.5 mil thickness for Si(Li)
  • Horizontal unitary cryostat with fixed geometry and conflat flange, 7.5 liter dewar
  • PO-14B pulsed optical feedback preamplifier
  • Appropriate bias, signal and power cables
  • Unlimited temperature cycling without loss of resolution
  • HV cut-off circuitry
  • Transistor reset preamplifier
  • Variable position (DS) cryostat with manual or motorized slide
  • Bellows vacuum seal
  • High angle entry configurations; custom configurations for unique applications
  • 15 liter dewar
  • Thin windows for light element detection
  • Low microphonic crystal mounting
  • R&D 100 award-winning PRISM Digital

X-ray detector with variable-position

Cryostat and Window Options

PGT offers a variety of standard and custommanufactured cryostat configurations. with hardware—such as windowless systems with automated gated assembly, telescoping cryostats, and other modifications—for interfacing with beam systems, scattering chambers, and Xray fluorescence systems. Window options include 0.3 and 0.5 mil beryllium and the PRISM light element window. Approximate PRISM window transmissions are 40% at C, 32% at N, 43% at O, 50% at F and 60% at Na.

Transistor Reset Preamplifier

PGT Transistor Reset Preamplifiers are designed for high count rate applications with an ECRP limit of greater than 800,000 MeV/second. The upper count rate limit and resolution of the system is thus determined primarily by capabilities of the gated integrator amplifier and the ADC units. Reset time is 6-10 mseconds (less than 2% dead time at 800,000 cps for a 60 Co spectrum). A 120 msecond delay before reset prevents energy discrimination in counting of the trigger event. The TR preamplifier operates over a limited dynamic output voltage range, allowing good linearity, excellent detector resolution, and minimal peak shift at high count rates.



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