Brochure of the Low Level Counter Series LB 761 & LB 790
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General
- Detectors and sample slides form one unit
- User-friendly PC software AMS (Activity measurement system for measurement and data acquisition)
- Service-friendly with regard to maintenance and repair
- Guard counter above the measuring counter for suppression of cosmic radiation (anticoincidence)
Features
- LB 790: Simultaneous α- and β-measurement (10-fold sample slide for measuring planchets up to Ø 60 mm)
- LB 761: Simultaneous α- and β-measurement (1-fold sample slide for measuring planchets up to Ø 200 mm)
- Modular detector pairs (2 detectors per module)
- Very low background guaranteed by 10 cm lead shielding on all sides
PC Software: AMS
- Parallel connection of several detector systems simultaneously (up to 4 systems)
- Automatic background subtraction
- Automatic half-life correction
- Live display of the detected activities and cpm values
- Stored measurements can be displayed on the monitor and evaluated at any time
- Data analysis with comprehensive graphics commands
Different Versions
LB 790 10-Channel α-β Low-Level Counter
The low-level activity measuring station LB 790 enables the simultaneous and separate measurement of even small activities of alpha and beta radiating radionuclides. Up to 10 sample bowls can be measured at the same time, whereby the associated sample information can be conveniently entered before the measurement using the associated PC software and evaluated after the measurement.
The detectors and the sample drawer - one single unit - can be pulled out of the lead shielding in case of repair. Should this be necessary a metal support and 9 lead bricks have to be removed. This enables an easy servicing of the low-level system, such as detector exchange.
Dual Detector LB 790
The measuring bowls (Ø 60 mm) are arranged in an extendable slide in two rows of 5 pieces each. The 10 ultra-flat flow proportional counter tubes are located directly above the measuring bowls and are protected at the bottom by a thin counter tube foil. The 10 measuring counters are covered at the top by a large-surface flow meter, which serves as a common screen. This screen meter is switched in anticoincidence with the meters to eliminate the cosmic radiation.
Replacement detector unit LB 790
LB 790 - 5L
Our low-level activity measuring station is available in various versions.
The LB 790-5L has 5 individual drawers for 2 samples each: Depending on your sample throughput and sample type, the number of sample positions belonging to a measurement series can be varied and changed if necessary.
With our LB 790-5L system, each of the five drawers can be loaded individually, so that up to five different sample measurements can be performed independently of each other.
LB 790-5L Low-Level Counter detector system
LB 761 α-β Low-Level Counter for 200 mm Planchets
The low-level measuring station LB 761 for 200 mm planchets enables the simultaneous measurement of alpha and beta radiation components of a sample in two separate measuring channels. The background rates of the system are exceptionally low, so that very good detection limits are achieved.
The detector system can consist of several detectors (number depends on free slots and USB interfaces), whose measurement results can be calculated by a computer and the evaluation program AMS.
For customers with high sample throughput and at the same time different sample sizes, we offer a hybrid version. To save space, various activity measuring stations from our portfolio are combined. For example, our 200 mm measuring station can be used as a hybrid with the 10-fold low-level activity measuring station LB 790.
Stainless steel planchet
Product comparison table
| Mechanical Data | |
| External dimensions (with lead shielding) | 850 x 545 x 320 (L x W x H in mm) |
| Weight (with lead shielding) | approx. 1200 kg |
| Dimension detector unit with sample drawer and electronics | 590 x 520 x 120 (L x W x H in mm) |
| Weight detector unit | 37.5 kg |
| Material detector module | cathode copper |
| Material guard counter | aluminium |
| Physical & Electrical Data | |
| Power supply electronics | +15/-15 V via LB 5330 |
| Total current consumption | 250 mA |
| Operating point with P-10 (typical) | 1450 V |
| Counting gas | ArCH4 (90/10) or ArCO2 (82/18) / ArCO2 (90/10) |
| Metrological Data (P-10) | |
| Typical background | < 0.1 cpm (Alpha) < 1.0 cpm (Beta) |
| Ambient Conditions | |
| Operating temperature range | 0°C to 50°C |
| Relative humidity | 10 to 80%, no condensing |
| Protection degree | IP 50 (according to DIN IEC 60529) |
| Mechanical Data | |
| External dimensions (with lead shielding) | 600 x 600 x 270 (L x W x H in mm) |
| Weight (with lead shielding) | approx. 1000 kg |
| Material detector module | electrolytic copper |
| Material guard counter | electrolytic copper |
| Physical & Electrical Data | |
| Power supply electronics | +15/-15 V via LB 5330 |
| Total current consumption (typical) | 250 mA |
| Operating point with P-10 | 1550 V (typical) |
| Counting gas | ArCH4 (90/10) or ArCO2 (82/18) / ArCO2 (90/10) |
| Metrological Data (P-10) | |
| Typical background | < 0.1 cpm (Alpha) < 15 cpm (Beta) |
| Ambient Conditions | |
| Operating temperature range | 0°C to 50°C |
| Relative humidity | 10 to 80%, no condensing |
| Protection degree | IP 50 (according to DIN IEC 60529) |