top of page

Lowest-Level γ-Spectrometer

with ultra low-background HPGe detectors, special lead & Cu shields, μ-veto shield as well as n- & Rn-suppression.

Application for nuclear sample mesurements

  • Ultra low-level background in vitro -
    γ-spectrometers (ULB) are designed for
    the direct assessment of extremely low
    sample activities (contaminations).

  • The concept and performance of our ULB spectrometers are designed for lowest limit of detection using the comfort of a ground level laboratory with fast and easy sample change compared to  undergraund labporatories.

In radiation protection for national & international institudes and industry

  • In Universities, research centers, nuclear medicine

  • dustry- and nuclear technology

  • Dismantling, consulting, waste management

  • Environmental, health and food surveillance and laboratories

  • Civil defense, emergency response, border, safety, security and access control

System description

Ultra-Low-Background HPGe γ-Detectors:

  • Large coaxial crystals,  Efficiency: from 60 % up to 150 %

  • Large planar crystals, Diameter: 5, 7, 8, ... cm;  Thickness: 1.5, 2, 3, .. cm

  • Ultra low background (ULB) version

Sample Geometry

  • Large coaxial crystals, Petrie shells, marinelli beaker and big bottles

  • Large planar crystals, Petrie shells, point & filter sources, ...


Spectrometry Electronics, Hardware and Software

  • State-of-the-Art digital spectrometry electronic

  • High performance data acquisition system

  • Latest analysis software solutions


ULB Sandwich Shielding Design

  • Excellent passive sandwich lead/Cu shield for photon absorptions     

  • Highly efficient shield for secondary neutron reduction

  • State-of-the–Art veto-shield to separate cosmic particles​


(1) outdoor, (2) + measurement dugout,
(3) + iron castle, (4) + passive detector shielding,
(5) + active detector shielding (veto)

Veto adjustment

Effectiveness of the shielding modules

Passive Front Loading Lead Shield

  • LB/ULB-lead + PE(B) + Cu + N2 layers

Anti Cosmic Veto Shield

  • Scintillation or gas detectors

Anti-Cosmic Electronic

  • digital

  • analogue

​Data Evaluation Software



As an example of minimum detectable activity (MDA), the CTBTO laboratory criterion of 24 mBq Ba-140 (in 7 days measuring time) will be achieved with our design of ULB gamma -spectrometer systems installed on ground level laboratories in approximate 1.5 days (black line and dots).

bottom of page