• Measuring of 137Cs in liquids and bulk goods by a 25 mm Ø × 25 Nal(TI) Crystal.

  • Through the attributes of the device a low detection limit of 20 Bq/l (t = 1 h) can be achieved.


  • 40K suppression by implementing a second energy window.
  • The LB 201 can be operated as a stationary or a mobile device and is thus flexible for your application.

More features

  • The evaluation unit of the LB 201 can display the measurement results in cps, Bq/kg and Bq/l, associated with a time stamp.
  • Sophisticated PC software tailored for your LB 201 helps you create protocols and manage measurements.
  • The LB 201 is calibrated by the manufacturer and can be checked annually using the optional calibration source.

Product Overview

The LB 201 comes with a tailored aluminum case in which all the device parts find space. 

Thanks to the modular design consisting of two separate units, the LB 201 adapts perfectly to your workplace.

Therefore, the transport and the flexible application of the LB 201 is ensured.


Read More

Separated in two units

The detector unit comes with a lead shielding to enhance the measurement results by reducing the background.

Clear and easy to read display

The evaluation unit of the LB 201 comes with a bright display which can show the measurement results in cps, Bq/l and Bq/kg.

The use of a Marinelli sample cup ensures a consistent measuring geometry. The plastic cup is ready for food samples, liquids and smaller bulk goods.


The automatic 40K suppression helps with achieving a more reliable result. A second energy window is implemented in order to subtract the influence of the high energy gamma emitter from the measurement result.



Technical Data

TypeNaI(Tl) Crystal 25 mm Ø x 25 mm
Probewith built-in threshold amplifier
and high-voltage generator
Operating Voltage5 VDC ±5 %
Max. current
1.5 A
DimensionsElectronics housing (120 mm × 120 mm)
Height: 190 mm with lead shielding
attached: 240 mm
Temperature rangeStorage: –20 to 55 °C
Operation: 5 to 40 °C
Transport: –20 to 55 °C
Rel. humidity10 to 85 %, non-condensing
Maximum tolerable
temperature change
+10 °C/h, –8 °C/h
AltitudeMax. 2000 m above sea level
ProtectionIP 55

Protection class

Weightapprox. 0.8 kg (without lead shielding)
Lead Shielding 
Dimensions (H × Ø)approx. 130 mm × 136 mm
Weightapprox. 8 kg
Measuring beakerPlastic, useable volume 0.5 l
(H × Ø) approx. 99 mm × 114 mm

Monochrome LCD 192 x 64 pixels

Electro-luminescent lighting

KeyboardMembrane keyboard, 6 buttons, 4 soft
keys, 1 × device on/off, 1 × sound/LCD
lighting on/off 2 LEDs for alarm display
and funktione control
Data storage2400 measured values with date and time
Dimensions200 × 400 × 300 (L × B × H in mm)
Weight1400 g (included Batteries)
Operation temperature
–20 °C to +40 °C
Storage temperature
–20 °C to +55 °C
Rel. Humidity10 % to 85 % (non-condensing)
External pressure500 hPa to 1300 hPa (in operation)
CommunicationUSB (1 device, 1 Host for Memorystick),
RS 485
AlarmsAcoustic: Piezo oscillator 2.5 to 3 kHz
alarm as an interrupted continuous tone,
single pulse (switchable) as tone burst
WarningsLED signals when threshold values are
exceeded or function display. Text
messages in the display for exceeding the
measuring range and detector failure.


59974Becquerel Monitor LB 201, incl. 1 ×
marinelli beaker 0.5 l, 1 × aluminium
transport case, PC software set and
device stand
85331 × Marinelli sample beaker, plastic,
useable volume 0.5 l
7187210 × Marinelli sample beaker, plastic,
useable volume 0.5 l
14324Calibration source (nuclide: 137Cs)