HPGe Planar and Semi-Planar Detectors

IGP and NIGP Diagram

Features:

  • Vertical dipstick cryostat
  • Standard 30-liter dewar
  • Aluminum endcap and beryllium window
  • RG-11 B/C resistive feedback preamplifier standard for detectors >500 mm˛ active area
  • P014-B pulsed optical feedback preamplifier standard for detectors <500 mm˛ active area
  • 12-ft. bias, signal and power cables
  • Unlimited temperature cycling without loss of resolution

Options:

  • A variety of cryostat configurations available, including low-background designs
  • Portable and mechanically cooled systems
  • Transistor reset preamplifier for high count rates
  • Ultra-low microphonic QUIET ONE™ mounting

PGT P-type germanium planar detectors have high efficiency in the lower energy ranges, making them the ideal detectors for transuranic materials and mixed gamma-ray and X-ray samples. The combination of the thin entrance layer with a beryllium endcap window lets these detectors see down to ~3 keV.

The IGP detectors are available in sizes from 25 mm˛ to 1000 mm˛ to meet your needs for economical small area counting at low to intermediate energies. IGP detectors retain their high resolution up to 1 MeV.

Detectors with active areas larger than 500 mm˛ have the standard resistive feedback preamplifier with an energy rate product limit (ECRPL) greater than 12,000 MeV/sec. Detectors with active areas <500 mm˛ are furnished with an optical feedback preamplifier (ECRPL of 200 GeV/sec) or, for higher count rates, a transistor reset preamplifier (ECRPL of 400 GeV/sec).

PGT N-type semi-planar germanium detectors offer the optimum in low noise and high resolution at low-to-moderate energies. NIGP detectors have active areas of 1500-3800 mm˛.

The capacitance of these detectors, with a wrap-around P+ contact and a small center N+ contact, is much less than that of a true planar of similar size. This results in lower noise and better resolution than achieved by any other detector geometry at energies of 3 keV to 1 MeV. Because the cylindrical walls are charge-collecting and because there are virtually no dead germanium layers beyond the active region, these detectors exhibit better count rate performance and peak-to-background ratios.

NIGP detectors are ideal for lung monitoring and body-burden assessments, especially with the JT Cool mechanical cooler.

View and Print with Adobe Acrobat Planar Detectors Data Sheet