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Ultra Low-background HPGe Detectors

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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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