LB 124 SCINT-D Contamination Monitor with Dose Rate Detector

The Contamination Monitor with Dose Rate Detector LB 124 SCINT-D is used to measure radioactive alpha and beta-gamma contaminations on surfaces such as floors, walls, desks, objects, clothing or skin as well as gamma dose rate in ambient dose rate equivalent H*(10).




  • Lightweight, easy to handle and rugged instrument
  • Wide temperature range

Contamination Detector

  • Simultaneous and separate measurement of alpha and beta-gamma contamination with a ZnS(Ag)-scintillation detector
  • High sensitivity and uniform response
  • No counting gas required

Dose Rate Detector

  • Detector positioned parallel to the front side of the instrument
  • Energy response to H*(10) Ambient Dose Equivalent
  • Halogen quenched Geiger-Müller tube
  • Dynamic Range: 0.1 μSv/h to 20 mSv/h
  • Energy Range: 50 keV to 1.3 MeV
  • Alarm threshold for dose rate measurement
  • Unit selection: μSv/h
  • Dose accumulation is possible

The Contamination Monitor LB 124 SCINT-D is a portable battery-powered instrument. It is comprised of a display unit with microprocessor electronics, a signal processing electronics and a ZnS-scintillator with photomultiplier and an active measurement area of 170 cm². Its sophisticated reflector geometry ensures an extremely flat response over the entire sensitive area.

Through the integration of an additional Geiger-Müller tube it is possible to measure gamma dose rate simultaneous besides regular contamination measurement.

Due to its attractive and ergonomic design and its low weight the LB 124 SCINT-D is easy to handle. Even under adverse conditions, the measured results can be read easily on the large-highly-resolution display with background lightning.

A few directly accessible function keys suffice to operate the LB 124 SCINT-D. The instrument´s surface can be easily decontaminated.

Display                       Monochrome LCD 192 x 64 pixel
Electro-luminescence illumination
Radiation detectorZnS(Ag) scintillator + Geiger-Müller tube
Detection of lightPhotomultiplier (PMT)
Measurement modes

α- and β-γ-measurement, simultaneous and separate,

additional gamma dose rate H*(10)

ratemeter, scaler-timer-mode, clearance measurement, survey mode

Entrance window’s dimensions118 mm × 145 mm
Sensitive area170 cm²
Entrance window’s material2 x 3 μm Plastic metallized (0.4 mg/cm²)
Protective Grid80 % Transmission
External dimensions240 mm × 140 mm × 110 mm (L x W x H)
Weight1400 g (with batteries)
AlarmAcoustic with adjustable alarm thresholds
Data memory1000 measured values with date & time
InterfaceRS232, headphone connection
Power supply

3 × C size batteries or NiMH batteries,
rechargeable by plug type power supply or alternatively in the wall mounting bracket

Max. operating time (without illumination)

> 50 h with alkaline batteries 7.8 Ah
> 25 h with NiMH batteries 4.5 Ah


Ambient Conditions
Temperature range-20 °C to +40 °C (operation)
-40 °C to +60 °C (storage)
Relative humidity0 % to 80 % (no condensation)
External pressure500 to 1300 hPa (operation)
100 to 1300 hPa (storage/transport)
Protection classIP 53 (according to IEC 60529)


Typical Efficiencies
(according to ISO 7503-1)
Contamination Detector: 
241Am44 %(α-channel)
239Pu41 %(α-channel)
14C29 %(β-γ-channel)
36Cl69 %(β-γ-channel)
60Co58 %(β-γ-channel)
137Cs71 %(β-γ-channel)
Backgroundapprox. 0.1 cps
approx. 10 cps
Gamma sensitivity
at 1 µSv/h (137Cs)
not detectable
< 100 cps
Spillover< 20 %
< 2 x 10-5
(α- to β-γ-channel)
(β-γ- to α-channel)
Measuring range
(Dead time < 10 %)
0 to 5.000 cps
0 to 50.000 cps
Overrange indicationat rates
> 50.000 cps
Suface response
max. ± 20 %          (α-channel with 241Am, β-γ-channel with 14C point sources)
Gamma Radiation Detector: 
Dose rate range0.1 µSv/h to 20 mSv/h
Energy range50 keV to 1.3 MeV
Calibration factor0.625 µSv/h per cps 137Cs
Intr. backgroundapprox. 0.07 cps


Order Information and AccessoriesIdent. No.
Contamination Montitor with DR DetectorLB 124 SCINT-D           60026

Test source


200 Bq 90Sr

800 Bq 241Am



Aluminum caseLB 124-KB38164
Power supplyMultirange58067
Wall bracketfor LB 124 SCINT38789
additional protection gridfor LB 124 SCINT45355
Data cableD-Sub cable 3 m26204
Rechargeable batteries3 x NiMH 1.2V/4.5 AH40650
Floor trolleyfor LB 124 SCINT41028
Sample holder with drawerfor LB 124 SCINT40927


  • Contamination monitor based on innovative scintillation technology
  • Additional Gamma Dose Rate Probe
  • Optional display of simultaneous α- and β-γ-contamination or display of α- or β-γ-contamination and gamma dose rate
Format Size
LB 124 SCINT Serie en PDF 323.16 KB