Features: Lithium-drifted silicon (10, 30, 60, or 80 mm2 ) High-purity germanium (10, 30, 50 or 100 mm2) 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 TR-1 Transistor reset preamplifier Appropriate bias, signal and power cables Unlimited temperature cycling without loss of resolution HV cut-off circuitry

Features: Variable position (DS) cryostat with manual or motorized slide JT Cool cryocooler with convenient stand for all-attitude, LN2-free operation 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

PGT manufactures both Si(Li) and HPGe detectors for X-ray analysis. Si(Li) detectors with the standard beryllium window have a useful energy range of 1-60 keV, while HPGe detectors are suitable up to 100 keV. Optional light-element capability extends the lower limit to below 200 eV. Both HPGe and Si(Li) detectors are fully temperature-cyclable and may be stored for long periods 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. These detectors are also interfaced with scanning electron microscopes for simultaneous qualitative and quantitative microanalysis of elements from boron through by energy-dispersive spectroscopy.

Cryostat and Window Options

PGT offers a variety of standard and custom-manufactured 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 X-ray fluorescence systems.

The JT Cool mechanical cooler, with the exclusive PGT QUIET ONE ultra-low microphonics mounting, assures laboratory-grade resolution anywhere.

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.  These values include the supporting grid.

PreamplifierTransistor Reset

PGT Transistor Reset Preamplifiers are designed for both ultra-low noise performance and high count-rate applications with an ECRP limit of >800,000 MeV/sec. 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 µsec. A 120 µsec. 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. Electronic noise levels of <50 eV FWHM can be achieved with small-area Si(Li) and HPGe detectors.