Radioactivity detector

semiconductorindustriallaboratory

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. DESCRIPTION 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)