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Ultra Low-background HPGe Detectors

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3D Plus
3DX-RAY
Argon Electronics
Astrophysics Inc.
Bertin Instruments
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Centronic Nuclear
Else Nuclear 
GEORADIS s.r.o.
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JAKUSZ
Kromek
Logos Imaging
Ludlum Measurements
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Radiation Solutions Inc.
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Application

Ultra low-background HPGe detectors are widely used in underground laboratories for determination of radionuclides activities in environmental or industrial samples at µBq/kg levels and in scientific experiements such as investigation of magnetic moment of neutrino, dark matter search, etc.

Design

  • Task related design (U-type, vertical, down-looking or portable cryostat)
  • Remote not cooled part of preamplifier
  • Zeolite is placed near not cooled part of preamplifier in order to be outside measuring chamber

Cryostat materials

  • Certified materials with low radiation impurities
  • Ultrapure aluminium–silicon alloy with U + Th content < 1, 0.5 or 0.2 ppb for detector holder and endcap
  • Freshly produced electrolytic copper for coldfinger an pedestal
  • Tested on radiopurity selected stainless steel screws and sapphire insulators

Technology

  • Transportation of HPGe crystal and cryostat materials by surface freight
  • Minimization of fabrication time (location of materials above ground)
  • Assembly in a cleanroom
  • Cleaning and passivation of copper surfaces
  • Storage of crystal and cryostat materials in a container made from materials effectively slowing down and absorbing neutrons (water and Cd)

Design features

  • Fabrication of large volume HPGe detectors without bulletization
  • Front end electronics made on low-background Teflon substrate
  • Passive screen between front end electronics and HPGe crystal made from Pb with Bi-210 radioactivity < 0.1 Bq/kg
  • Double-crystal HPGe detector design
  • Multi-crystal HPGe detector design

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