Ailun AL-FS6100 Low-Background Alpha/Beta Counter

Overview

The Ailun AL-FS6100 Low-Background Alpha/Beta Counter is a laboratory-grade activity meter engineered for precise quantification of gross alpha and gross beta radioactivity in environmental and regulatory compliance samples—including drinking water, natural mineral water, food matrices, soil leachates, and airborne particulate filters. It operates on the principle of solid-state alpha/beta discrimination via pulse-height analysis of ionization events in planar silicon detectors under ultra-low-background conditions. Each channel employs independent vacuum-tight sample chambers coupled to high-efficiency PIPS detectors optimized for ²⁴¹Am (5.64 MeV alpha) detection—delivering up to 5× higher geometric efficiency compared to conventional cylindrical or gridded proportional counters. The instrument achieves sub-mBq/L minimum detectable activities (MDA) for both alpha and beta emitters when operated under shielded conditions per ISO 8519 and IEC 61000-4-3 standards.

Key Features

• Truly independent multi-channel architecture: 2/4/6/8 channels operate autonomously—each with separate timing control, preset count duration, dead-time correction, and energy threshold configuration.
• No forced synchronous sampling: Unlike legacy systems requiring simultaneous insertion of all samples, the AL-FS6100 permits staggered loading; unused channels remain idle without compromising measurement integrity or data traceability.
• Fully computer-controlled operation: All high-voltage bias (0–2000 V, 0.1 V resolution) and discriminator thresholds are digitally set via USB interface—eliminating analog potentiometers and mechanical drift.
• CPLD-based digital signal processing: Real-time pulse shaping, pile-up rejection, and dual-parameter (energy vs. time) histogramming performed at hardware level for deterministic latency and reproducible spectral response.
• Enhanced detector geometry: Flat-face PIPS detectors minimize source-to-detector distance variance and maximize solid-angle acceptance—critical for thick-source methodology compliance per HJ 898–2017 and HJ 899–2017.
• Robust electromagnetic shielding: 19″ rack-mount chassis integrates 3 mm lead + 1 mm copper layered door with microswitch interlock, meeting ANSI N42.17B background suppression requirements.

Sample Compatibility & Compliance

The AL-FS6100 supports standard 47 mm and 50 mm diameter filter papers, evaporated residue pans, and planchet-mounted solid samples per ASTM D3648 and ISO 11704 protocols. Its measurement workflow adheres strictly to Chinese national standards for public health surveillance: GB 5749–2006 (drinking water safety limits), GB/T 5750.13–2006 (analytical validation requirements), GB 8537–2008 (mineral water classification), and the method-specific performance criteria outlined in HJ 898–2017 (thick-source alpha) and HJ 899–2017 (thick-source beta). Data acquisition and reporting modules support audit-ready metadata logging—including operator ID, calibration certificate number, source geometry, and chamber pressure—enabling full GLP/GMP traceability.

Software & Data Management

The bundled Windows-native application implements a true multi-document interface (MDI), allowing concurrent acquisition, spectral review, decay correction, and report generation across multiple active channels. All operations run in isolated threads—ensuring uninterrupted counting during background subtraction or efficiency calibration. Raw spectra and live count rates are stored in vendor-neutral CSV and HDF5 formats. Audit trail functionality records every parameter change with timestamp, user login, and IP address (where network-enabled). Optional FDA 21 CFR Part 11 compliance package provides electronic signature enforcement, role-based access control, and immutable record archiving.

Applications

• Regulatory monitoring of radionuclides in municipal water supplies and bottled water production lines.
• Environmental baseline studies for uranium mining sites, nuclear facility perimeters, and post-decommissioning verification.
• Food safety screening for fallout isotopes (e.g., ⁹⁰Sr, ¹³⁷Cs, ²¹⁰Po) following radiological incidents.
• Research-grade alpha spectrometry pre-screening prior to high-resolution semiconductor analysis.
• Quality assurance in radiopharmaceutical manufacturing where low-level beta contamination must be excluded.

FAQ

What is the minimum detectable activity (MDA) for ²⁴¹Am and ⁹⁰Sr under typical operating conditions?
MDA values depend on background rate, counting time, and sample geometry. Typical MDA ranges are 0.02–0.05 Bq/kg for alpha emitters and 0.05–0.15 Bq/kg for beta emitters using 24-hour counts on 1 L water-equivalent samples.
Does the system require external cooling or gas supply?
No. The AL-FS6100 uses air-cooled PIPS detectors and operates in ambient atmosphere—no liquid nitrogen, P-10 gas, or vacuum pumps are required.
Can the software export data to LIMS platforms?
Yes. ASCII-delimited output (CSV/TXT) and structured XML reports are fully compatible with major laboratory information management systems including Thermo Fisher SampleManager, LabVantage, and STARLIMS.
Is firmware upgrade supported remotely?
Firmware updates are delivered via signed .bin files through the USB interface; no physical service visit is needed for routine maintenance releases.
What documentation is provided for regulatory audits?
Each unit ships with a Factory Calibration Certificate (traceable to CNAS-accredited reference sources), Electrical Safety Report (IEC 61010-1), and full Software Verification Protocol confirming compliance with ISO/IEC 17025 clause 5.9.