Ailun AL-FS2010 Personal Dosimeter for X and Gamma Radiation Dose Equivalent Monitoring

Overview

The Ailun AL-FS2010 Personal Dosimeter is a compact, battery-powered instrument engineered for real-time monitoring of ambient X and gamma radiation fields in occupational and environmental settings. It operates on the principle of gas ionization detection using a large-volume Geiger-Müller (GM) tube, optimized for high sensitivity down to near-background radiation levels (~0.1 µSv/h). The device measures both dose equivalent rate (Ḣ) and cumulative dose equivalent (H), conforming to ICRP and IEC 61526:2010 definitions for operational radiation protection quantities. Its energy response (48 keV–1.5 MeV) covers common photon-emitting radionuclides including ¹³⁷Cs (662 keV), ⁶⁰Co (1.17/1.33 MeV), and diagnostic X-ray spectra (e.g., 80–140 kVp). Designed for continuous wear by personnel in regulated environments, it delivers traceable, field-deployable performance without requiring external bias voltage or temperature stabilization.

Key Features

• Large-area GM tube detector with enhanced low-dose sensitivity—capable of resolving dose rates approaching natural background levels.
• Adaptive digital filtering algorithm improves signal-to-noise ratio and reduces statistical fluctuation during low-flux measurements.
• Dual-parameter readout: simultaneous real-time display of dose equivalent rate (µSv/h) and accumulated dose (µSv/mSv) with user-selectable units (including µR/h and CPM).
• Configurable multi-level alarm system with independent thresholds for rate and cumulative dose; supports audible, visual, and tactile alerts.
• Integrated real-time clock (RTC) ensures time-stamped data logging; all stored measurements persist through power loss.
• Ultra-low power architecture (2000 hours of continuous operation on standard AAA batteries.
• Mini-USB interface compliant with USB 2.0 full-speed specification for firmware updates and bidirectional data transfer.
• Ruggedized housing (IP54-rated ingress protection) and ergonomic form factor (116 × 60 × 22 mm, 90 g) support extended wear under PPE or in confined workspaces.

Sample Compatibility & Compliance

The AL-FS2010 is calibrated against traceable ¹³⁷Cs and ⁶⁰Co reference sources per ISO 4037-3 and verified per ANSI N42.22-2021 for personal dosimeter performance. It meets the functional requirements of IEC 61526:2010 (Radiation protection instrumentation — Measurement of personal dose equivalents Hp(10) and Hp(0.07)) for photon radiation. While not classified as a legally accredited dosimeter under national type approval schemes (e.g., NIST NVLAP or UK HSE), its metrological characteristics—including stated basic relative error (±25% for rate, ±15% for cumulative dose) and energy dependence—are suitable for routine area surveillance, task-based exposure assessment, and supplementary personal monitoring where regulatory-grade TLD/OSL dosimetry is not mandated. It is routinely deployed in non-classified zones of nuclear facilities, industrial radiography bays, radiotherapy support areas, and environmental perimeter monitoring stations.

Software & Data Management

The included Ailun Personal Dosimetry Management Software (v3.x) runs on Windows 10/11 and supports import of time-synchronized measurement logs via Mini-USB. Each record contains timestamp, dose rate, cumulative dose, alarm status flags, and battery level. Export options include CSV and PDF reports compatible with internal QA workflows. Audit trail functionality logs all user-initiated configuration changes (e.g., alarm threshold edits, measurement interval selection) with timestamps and operator ID fields. The software does not implement FDA 21 CFR Part 11 electronic signature controls but supports GLP/GMP-aligned documentation practices through manual validation protocols and version-controlled report templates.

Applications

• Nuclear power plant auxiliary staff monitoring during refueling outages and maintenance interventions.
• Industrial radiographers performing X-ray or ¹⁹²Ir/⁶⁰Co gamma NDT inspections in field or workshop settings.
• Radiotherapy physics technicians conducting leakage surveys around linear accelerators and cobalt units.
• Research laboratory personnel handling sealed sources (e.g., ²⁴¹Am, ¹³⁷Cs) in teaching or calibration labs.
• Environmental health & safety officers conducting baseline and periodic surveys around nuclear medicine departments or waste storage sites.
• First responders equipped with rapid-deployment radiation survey kits for incident characterization.

FAQ

Is the AL-FS2010 suitable for legal dosimetry compliance (e.g., worker dose of record)?
No—it is intended for supplemental or indicative monitoring only. For regulatory dose-of-record applications, accredited thermoluminescent (TLD) or optically stimulated luminescence (OSL) dosimeters certified per ISO/IEC 17025 are required.
Can the device measure beta or neutron radiation?
No—the GM tube is unshielded but inherently insensitive to beta particles below ~200 keV and completely insensitive to neutrons. It is optimized exclusively for photons (X and gamma rays).
What is the recommended calibration interval?
Annual calibration against accredited reference sources is advised; more frequent verification (e.g., quarterly) is recommended in high-use or high-dose-rate environments.
Does the software support multi-user role-based access control?
No—user accounts are not implemented. All configuration and data export functions are available to any operator with local administrative rights on the host PC.
How is energy dependence compensated across the 48 keV–1.5 MeV range?
Compensation is achieved via physical filter design (e.g., aluminum/copper absorber layers over the GM cathode) combined with firmware-based correction coefficients derived from calibration measurements at discrete energies per IEC 61526 Annex B.