GammaTwin S

GammaTwin S with contamination probe ABG170

Dose rate meter with alarm function for personal radiation protection when handling ionising radiation and for the
detection of the dose rate and local dose.


Fields of application

Fire Brigades, Civil Defence, Authorities, Customs,
Nuclear Technology, Industry, Chemistry


  • small and handy dose rate meter for the measurement of gamma radiation and X-rays
  • measurand: ambient dose rate equivalent Ḣ*(10) and
    ambient dose equivalent H*(10) (local dose)
  • built-in detector: energy compensated GM tube
  • large, digital indication of measured values on LC-display (backlit)
  • selectable simultaneous or separate indication of dose and dose rate,  additionally analog indication of dose rate (logarithmic bar graph)
  • display of the dose rate history as a search function for the detection of radioactive sources
  • 4 preset dose and dose rate alarm thresholds
    (on demand adjustment of customised alarm thresholds) 
  • additionally switchable acoustic single-pulse indication
  • automatic and continuous storage of the dose into a
    non-volatile memory
  • storage of the dose and of set parameters even during battery change
  • permanent self test
  • designed for rough use, housing made of aluminium,
    protection class
     IP54 (splashproof)
  • menu-driven user navigation
  • supplied with robust nylon bag
  • optional: external probes, probe cable
  • connection facility for an external probe:
    • 18526 D or ABG170 for contamination measurement (α, β, γ)
    • immersion counter tube ZP1083 D (β, γ)
    • NaI-scintillation probe 2002 for high-sensitive measurements (β, γ)
  • with connected probe:
    • display of measured values in cps
    • display of the pulse rate history graph as a search function for the detection of  radioactive sources or contaminations
    • pre-selectable alarm thresholds: 2x background or 3x background

PLEASE NOTE:  Detecting the personal dose requires a measuring
                            instrument with the measurand Hp(10).


Technical Data

Indication ranges
- dose rate
- dose

0 nSv/h ≤ Ḣ*(10) ≤ 50 mSv/h
0 nSv ≤ H*(10) ≤ 1 Sv
Measuring ranges
- dose rate
- dose
- cps

0.5 µSv/h ≤ Ḣ*(10) ≤ 50 mSv/h
0.5 µSv ≤ H*(10) ≤ 1.0 Sv
acc. technical data
of the connected probe
Energy range 40 keV up to 1.3 MeV
Dose rate alarm thresholds 7.5 µSv/h, 25 µSv/h,
40 µSv/h, 300 µSv/h
Dose alarm thresholds 200 µSv, 500 µSv,
1000 µSv, 2000 µSv
Temperature range -20°C up to +60°C
Power supply 2 batteries 1.5 V (type AAA)
Acoustic alarm approx. 80 dB(A)
measured in 30 cm distance
Dimensions/Weight (26 × 66 × 103) mm
190 g (with batteries)