LB5500 Large Area Automatic Low Background Alpha/Beta Counting System
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Features
- Automatic single 5 inch detector, ultra-low background counting system
- Enhanced low background capability
- Gas Stat digital gas conservation and monitoring system
- Fifty planchet sample changer
- Low background passive shielding
- True bench-top model with reduced system footprint and integrated portable cart
- High performance 12.7 cm (5.0 in.) gas flow detector with ultra thin window 80 mg/cm2; one inch detector option
- Advanced electronic diagnostics continuously monitor operating conditions
- Universal auto-sensing power supply
- Coded positive sample carrier identification
- Optional external bar code reader
- CE compliant
Description
Large Area Counting System
The Tennelec LB5500 is designed for counting large samples, up to 12.7 cm (5 in.) in diameter. Built on the same foundation of quality and innovation as other Series 5 systems, the Tennelec LB5500 offers low background performance for applications requiring a large area counting system. The added capabilities of Eclipse Control and Analysis Software make the LB5500 a state-of-the-art counting system that easily integrates into today’s count room. Specially designed detector windows provide the Tennelec LB5500 with excellent counting efficiency exceeding current regulatory requirements.
Whether counting large area air filters or for methods requiring additional sample amounts, the LB5500 is the system of choice.
Enhanced Low Background and Productivity – Simply the Best
Due to increasing environmental regulations to reach lower detection limits, sample count times have increased reducing the overall sample throughput in the laboratory. The Tennelec LB5500 incorporates new technology to reduce system background and increase sample throughput. Using an improved guard detector, the system sensitivity for high energy, cosmic background is increased, enabling the anti-coincidence circuitry to detect and reject more spurious background events.
The beta background for the LB5500 has been reduced by as much as 25% over older systems. Beta backgrounds as low as 3.0 cpm can be achieved. This means that the system can count almost twice as many samples for a given detection limit as a counter with a beta background of 5.0 cpm.
Passive Metric Shield
Using a graded shielding system, the LB5500 counts large area samples with more accuracy than any other low background counter. The passive shield system provides 10 cm (4 in.) of low background lead surrounding the detector. The shield comprises standard 5 x 10 x 20 cm metric lead bricks which weigh no more than 12 kg (25 lb) each for safety and ease of assembly. This lead is secured within a steel housing for further safety and to ensure minimal shifting.
Time Proven Reliability
The sample changer of the LB5500 is time and field proven. The highly reliable design of the automated sample changer transports and counts samples day after day providing worry free operation. When work counts and time is precious, count on a Tennelec system to deliver results and reliability.
Ultra-Thin Detector Windows
The standard gas flow detector of the Tennelec Series 5 family of systems incorporates a high performance pancake-style 12.7 cm (5.0 in.) detector. The entrance window of the detector is made with state-of-the-art technology and special materials to provide the highest counting efficiency and the lowest alpha background of any counter. Standard detector windows are 80 mg/cm2 with 500 mg/cm2 window as an option.
Positive Sample Identification and Bar Code – The Advantage
Today’s changing requirements demand sample identification that is maintained through the counting data. Data defensibility is a priority.
The Tennelec LB5500 incorporates unique carrier and sample identification systems to maintain chain-of-custody. An optional handheld bar code scanner allows input of sample information directly into the Eclipse software for improved chain-of-custody verifiability.
As the sample is counted, the
carrier ID or sample bar code are automatically captured by the Eclipse software
and stored with the sample count data forming the missing link in sample custody
in the count room.
Tennelec sample carriers are washable for easy cleaning and decontamination. Each carrier is permanently coded with a unique number that is non-removable after numerous washings.
Circuitry So Advanced, It Thinks for Itself
The advanced electronics package of the Series 5 family of counting systems provides the most advanced control and monitoring system available. The Series 5 incorporates hardware diagnostics which continuously monitor internal and external parameters including gas pressure and flow, system voltage, power distribution, sample and guard counts, and other system critical parameters. The user is alerted on the front panel if any of these parameters fall below normal operation thresholds. This allows you to take immediate action when a problem arises.
Circuitry So Advanced, It Thinks for Itself
The advanced electronics package of the Series 5 family of counting systems provides the most advanced control and monitoring system available to assure accurate results. The Series 5 incorporates hardware diagnostics which continuously monitor internal and external parameters including gas pressure and flow, system voltage, power distribution, sample and guard counts, and other system critical parameters. The user is alerted on the front panel if any of these parameters fall below normal operation thresholds.
Human Factor Engineering
Often computer controlled analytical equipment requires additional laboratory space for the computer system and peripherals. The LB5500 answers that problem with an integrated mobile cart that provides all of the support necessary for the gas tank, computer system, monitor and printer. The articulating monitor support provides adjustable viewing angles without requiring additional space on the desktop. The retractable shelf opens to hold printer and supplies.
The LB5500 is designed to be a completely integrated, self contained counting system. The LB5500 has the industry’s smallest footprint for a large area counting system, so it takes up less space compared to other large area systems.
Gas Stat Gas Conservation System
Conventional low background counters have manual gas flow control and use the equivalent of a 1A gas cylinder on the average of once per six weeks. Changing gas supplies usually means re-verification of critical system calibrations which can be an unnecessary time consuming process. Time and the impact on data quality can become significant issues when frequent re-calibrations must be performed due to a change in gas quality.
The Series 5 incorporates a microprocessor controlled gas monitoring and control system that provides worry free operation. Gas Stat eliminates the need to adjust manual flow meters and flow rates are digitally displayed in real time on screen. The normal gas flow rate is set by the operator through software control. The Series 5 hardware senses when the system is not counting samples, and automatically reduces the gas flow rate to a low quiescent flow to maintain detector gas quality. This prevents atmospheric impurities from diffusing into the detector and causing questionable results. When the user starts a count, Gas Stat automatically purges the detector and resets the flow rate back to normal. Gas Stat uses a preset maximum flow rate for the detector purging; so, it is virtually impossible to cause window damage due to over pressurization.
Gas Stat effectively increases the useful life of the gas supply thereby reducing the frequency of instrument re-verification, saving time and improving the quality of counting data.
Eclipse – Powerful and Flexible
The Tennelec LB5500 has been designed to take full advantage of computer based system integration. The LB5500 uses the Eclipse software to provide the optimum combination of power and ease of use for a low background system.
Eclipse is a true 32-bit multi-tasking Windows application that uses an industry standard database for storage of count data. The Microsoft Access database also allows for easy interfacing to network systems, since it is ODBC compliant and supports SQL operations. Custom reports can be easily developed for your application or presentation using a powerful, sophisticated reporting application.
Final activity results can be viewed on-screen for each sample as it is counted. Using split-window technology, the user can also view sample acquisition data and systems status data simultaneously. An intuitive, symbolic icon tool bar provides access to functions at the push of a button.
No other large area counter can match the advanced automation capabilities and features of the LB5500 and Eclipse software.
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