HD-2007 Gamma Directional Radiation Survey Meter
| Origin | Beijing, China |
|---|---|
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (PRC) |
| Model | HD-2007 |
| Price Range | USD 1,400 – 2,800 |
| Instrument Class | Dose Rate Meter (Gamma) |
| Portability | Handheld |
| Measured Radiation | Gamma Photons (⁶⁰Co, ¹³⁷Cs, natural U/Th/K series) |
| Detector Configuration | Dual Scintillation Crystal + Single PMT |
| Measurement Range | ≤350,000 nGy/h (equivalent to 40,000 µR/h) |
| Sensitivity | ≥350 counts per second at 1 µGy/h (10³ nGy/h) |
| Angular Acceptance | 110° ±5° |
| Directional Discrimination | ≥99% |
| Nonlinearity | ≤±10% |
| Environmental Operating Range | 0–45°C, ≤95% RH at 40°C |
| Power Supply | 7 Ah Li-ion rechargeable battery (or optional AA alkaline), power consumption ≤700 mW |
| Dimensions & Weight | 180 × 95 × 145 mm, 2.2 kg |
| Calibration & Traceability | Certified by Nuclear Industry Radioactive Exploration Metrology Station (NIREMS), full traceable calibration certificate provided |
Overview
The HD-2007 Gamma Directional Radiation Survey Meter is a handheld, field-deployable dose rate instrument engineered for directional gamma radiation mapping in geological and environmental radiometric applications. It operates on the principle of scintillation detection using a dual-crystal (typically NaI(Tl) or CsI(Tl)) configuration coupled to a single photomultiplier tube (PMT), enabling spatial discrimination of incident gamma photon flux. Unlike isotropic survey meters, the HD-2007’s collimated geometry and asymmetric crystal arrangement provide high directional selectivity (>99%), allowing users to isolate and quantify gamma emissions from specific azimuthal sectors—critical for uranium exploration, borehole logging support, surface radiometric mapping, and radioactive source localization in decommissioning or emergency response scenarios. The instrument complies with IEC 60846-1:2014 (Radiation protection instrumentation – Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation) for performance classification as a Class II directional dose rate meter.
Key Features
- Dual-scintillator + single-PMT architecture optimized for angular response control and directional sensitivity enhancement
- Microprocessor-controlled digital signal processing with real-time background subtraction and pulse-height discrimination logic
- Simultaneous digital numeric display and analog bar-graph rate meter for intuitive field interpretation
- User-configurable acoustic and visual alarm thresholds with programmable setpoints across the full measurement range
- Onboard non-volatile memory storing up to 100 data pages (6,049 total measurements), each timestamped and geotag-ready via external GPS integration
- USB 2.0 interface compliant with CDC ACM class for direct connection to Windows/Linux hosts without proprietary drivers
- Low-power design (24 hours continuous operation on a single 7 Ah Li-ion cell; field-replaceable AA battery option ensures operational continuity in remote settings
- Ruggedized housing rated IP54 for dust and splash resistance, with ergonomic grip and anti-slip rubber overmold
Sample Compatibility & Compliance
The HD-2007 is calibrated for terrestrial gamma-emitting radionuclides including ²³⁸U series (e.g., ²¹⁴Bi), ²³²Th series (e.g., ²⁰⁸Tl), and ⁴⁰K, with energy response flatness ±15% from 60 keV to 1.3 MeV. It meets national metrological verification requirements per JJG 377–2015 (Verification Regulation for Gamma Radiation Survey Meters) and carries formal certification from the Nuclear Industry Radioactive Exploration Metrology Station (NIREMS), an accredited body under CNAS (China National Accreditation Service). While not FDA 21 CFR Part 11 or EU IVDR-certified (as it is not a medical device), its audit trail functionality—including immutable timestamps, user ID logging, and firmware-locked calibration parameters—supports GLP-compliant data acquisition in environmental monitoring programs aligned with ISO/IEC 17025:2017 laboratory management systems.
Software & Data Management
The HD-2007 interfaces with the optional RadiLog Pro desktop application (Windows 10/11, 64-bit), which enables batch download, spectral histogram visualization, directional vector plotting, and export to CSV, XML, or GeoJSON formats. All stored records include detector temperature, battery voltage, measurement duration, and directional weighting factor. Firmware updates are delivered via signed binary packages verified through SHA-256 checksums. Data integrity is preserved through cyclic redundancy check (CRC-16) on all USB transfers, and the instrument logs every configuration change with UTC timestamp and operator code.
Applications
- Uranium prospecting: gamma logging of drill cores, trench walls, and adit exposures with directional bias correction
- Environmental baseline surveys: identification of anomalous gamma sources in soil, sediment, or building materials
- Nuclear facility perimeter monitoring: directional discrimination between background and potential leakage vectors
- Decommissioning support: rapid scanning for residual contamination hotspots with angular context
- Educational field training: demonstration of gamma attenuation, inverse-square law, and shielding effectiveness
- Regulatory compliance reporting: generation of auditable dose rate profiles per national radiation protection guidelines (e.g., GB 18871–2002)
FAQ
What gamma energies does the HD-2007 respond to most efficiently?
The detector exhibits peak sensitivity between 200 keV and 1.0 MeV, aligning with dominant emissions from ²¹⁴Bi (609 keV), ²⁰⁸Tl (583 keV), and ⁴⁰K (1461 keV).
Can the instrument distinguish between natural and anthropogenic radionuclides?
No—it measures total gamma dose rate without spectral resolution. Isotopic identification requires a gamma spectrometer (e.g., HPGe or LaBr₃-based system).
Is the directional response validated across all orientations?
Yes; angular response characterization was performed per IEC 61005:2007 using calibrated ¹³⁷Cs and ⁶⁰Co point sources at 1 m distance, confirming ≥99% directional fidelity within the 110° acceptance cone.
Does the USB interface support real-time streaming?
No—data transfer is batch-only upon request. Real-time telemetry requires third-party serial-to-WiFi bridge hardware.
How often must the instrument be recalibrated?
Annual calibration is recommended; NIREMS certifies validity for 12 months from date of issue under normal operating conditions and proper storage.
