LB 148 Personal Contamination Monitor with back of hand measurement

Radionuclides are widely used in many fields of research, nuclear medicine and in life science. Wherever unsealed radioactive materials are used, radiation protection regulations require contamination monitoring for hands, feet and clothing.

The LB 148 is a compact versatile Personal Contamination Monitor for radiation protection applications with back of hand measurement. By means of the new scintillation technology it is possible to measure alpha and beta/gamma contaminations simultaneously but the instrument can also be used as pure alpha or pure beta/gamma monitor. The results can be represented in freely selectable units Bq/cm² or in cps.

The LB 148 has a removable hand probe for clothing measurements. A personal registration can be made with optional card reader or transponder.

Tabs

Features
  • Low-maintenance ZnS(Ag)-scintillation detectors
  • Simultaneous back of hand measurement with automatically moving back of hand detector for optimal measurement geometry
  • Space-saving design
  • High detector efficiencies
  • Removable hand probe for clothing measurement
  • Simple operation with graphic display and touch display
  • USB, Ethernet, RS 232 and RS 485 interface
  • Service functions (plateau, calibration, systematic test,…)
  • Permanent data memory for 10000 measuring data
  • Extensive nuclide library
  • Card reader/transponder for access control (optional)
  • Double password hierarchy
  • Voice output: Voice instructions, if activated, are output by the monitor
Details

The operation of the LB 148 is very easy by means of the touch panel on the graphical display and the clearly arranged menu structure. In addition, a voice output can be activated to get voice instructions by the monitor.

The monitor can be switched easily between different lead nuclides before the measurement.

Each detector has its own calibration factor for each nuclide and a spillover factor for each alpha nuclide. The input of all parameters is password protected. Calibration factors for more than 50 nuclides in accordance with DIN ISO 7503-1 and A-100 (DIN 44801) are already existing in the software.

The background radiation is continuously monitored for each detector and used to compensate the measurement with the long-term average background value. Before the start of each measurement the background is checked for fluctuations.

The detection limits are calculated according to DIN ISO 11929 for each measured value and will be stored together with the measurement values.

The LB 148 complies with the requirements of the international standard IEC 61098. This is true in particular for the detector performance, the manufacturers’ calibration procedures and the determination of efficiencies.

Numerous service functions permit easily measurements for necessary periodical tests. These include automatic plateau measurement, calibration routines for all detectors and a fast system test.

Up to 10000 measuring data can be stored and transferred via USB, Ethernet, RS 232 or RS 485 to an external computer. A simple communication protocol permits the integration into a measuring network.

As an option, a alarm column, transponder, card reader or printer can be connected. If requested, a gate can be released if no contamination is detected.

Specifications
Electronics
CPUNXP i.MX 6 ARM Cortex-A9 Windows Embedded Compact 2013
DisplayColoured 7" Touch Panel, 800 x 480 pixels
Interfaces5 USB (Host), 1 USB (Device), 1 Ethernet 10/100/1000Mb, 1 RS232, 1 RS485
External signal transmitters3 relays max. 50 V, 5 A
Power supply100 - 240 VAC wide-range input, 50/60 Hz
Power consumptionabout 14.5 W
Fuse2 A

 

Mechanical Data
Dimensions (without alarm tower)85 x 125 x 82 cm³ (W x H x D)
Weightapprox. 45 kg

 

Hand Detectors
Detector                                              ZnS(Ag) scintillator with light-tight Hostaphan foil
Entrace window´s dimensions150 mm x 230 mm
Sensitive area345 cm²
Transmission protective grid80 %
Typical background

α-channel

β-channel

about 0.1 cps

about 15 cps

Typical efficiencies

(ISO 7503-1)

14C

36Cl

90Sr/90Y

241Am

20 %

49 %

52 %

33 %

Typical MDA

(ISO 11929)

with 10 s measuring time

14C

36Cl

90Sr/90Y

241Am

0.649 Bq/cm²

0.135 Bq/cm²

0.126 Bq/cm²

0.026 Bq/cm²

 

Foot Detectors
Detector                                              ZnS(Ag) scintillator with light-tight Hostaphan foil
Entrace window´s dimensions150 mm x 370 mm
Sensitive area555 cm²
Transmission protective grid72 %
Typical background

α-channel

β-channel

about 0.2 cps

about 40 cps

Typical efficiencies

(ISO 7503-1)

14C

36Cl

90Sr/90Y

241Am

21 %

54 %

43 %

19 %

Typical MDA

(ISO 11929)

with 10 s measuring time

14C

36Cl

90Sr/90Y

241Am

0.954 Bq/cm²

0.191 Bq/cm²

0.254 Bq/Cm²

0.055 Bq/cm²

   

 

Ambient Conditions
Temperature range                - 5 °C to + 40 °C (operation)
Relative humidity0 % to 90 % (no condensation)

 

Accessories
Accessories optional                                                                               Ident. No.
Transponder system (RFID)for person identification66164
Transponder Chip/Cardfor transponder59495/59503
Card readerfor person identification66442
Magnetic cardfor card reader34481
Alarm columnSignalization of device status and contamination66458

Calibration sources
 

36Cl, approx. 1 kBq
241Am, approx. 1 kBq

29336
25509

HFK-ProgramAcquisition of measured data into Access-DatabaseUMAD HFK

 

Applications

The LB 148 is used in:

  • Radionuclide Laboratories
  • Nuclear Facilities
  • Environmental Measurement / Homeland Security
  • Nuclear Medicine
  • PET Facilities
Download
Brochure
Format Size
LB 147 / LB 148 Brochure en PDF 687.44 KB

News about this product

The integration of two additional detectors for the back of hand measurement saves valuable time in the measurement process which is very important in nuclear facilities. Read more
03.04.2012