1.Product Introduction

    HD-2000 Gamma-Ray Radiometer is a portable intelligent radiometer, which is developed and produced with GPS positioning system using military technology by Beijing Nuclear Industry Geological Research Institute.
The instrument is suitable for applications where the measurement of radioactivity is required. It is mainly used in radioactive deposit survey, environmental assessment, radioactive sites measuring, environmental monitoring, radiation monitoring to import or export goods and transportation materials, etc.

2.Features of Intelligent Gamma-Ray radiometer are shown below:
1.Low power consumption, novel structure, small volume, light weight, and easy to carry.
2.Machine self-checking function, hardware monitoring, high system reliability.
3.LCD with backlight display, menu is easy to operate.
4.IPX5 waterproof design is suitable for the complex field environment.
5.Measurement results can be selectively displayed, including exposure rate (nC·kg-1·h-1), content (Ur or ppmeU), count rate (cps), intensity of Gamma-Ray (μR/h), absorbed dose rate (nGy/h), effective dose equivalent rate (μSv/h).
6.Three measurement modes include scan measuring, fixed-point measuring, and continuous measuring.
7.Radioactive intensity alarm, equipped with headphones.
8.GPS positioning system, the positioning data is combined and stored

with the measuring data.
9.Calibration factors and setting parameters can be stored in the machine.
10.Large storage capacity. The maximum storage capacity is 120000 measuring data.
11.The instrument can be connected to the computer via wireless Bluetooth to start measurement or download the measured data.

3.Instrument Theory

When Gamma-Ray enters the scintillator, the electron in the scintillator atoms is excited to produce fluorescence. The photon is coupled to the photomultiplier cathode via optoelectronic media, producing photoelectric effect and forming photoelectrons. The optical signal is multiplied step by step after entering the photomultiplier tube and converted into electric signal in the anode load. After amplified and discriminated, the electric signal enters counter circuit and triggers the counter.
The instrument detector consists of NaI(Tl) crystal and photomultiplier tube. The counting rate converted from detector output pulse is proportional to the intensity of radiation or radioactive substance content.
The instrument consists of detectors module, CMOS gate circuit, high/low voltage power supply module, MCU control system module, watchdog circuit, GPS positioning module, LCD display circuit, communication interface circuit, alarm circuit and touch keys.
The circuit principle diagram is shown as follows:

4.Specification

1. Measuring Range:

Content: ≤ 30000 Ur (Equivalent Uranium) Exposure Rate: ≤ 5000 nC·kg-1·h-1

Absorbed Dose Rate: ≤ 300 μGy/h (in the air)

Effective Dose Equivalent Rate: ≤ 210 μSv/h (in the air)

2. Sensitivity: Content: ≥ 5 s^-1/Ur

Exposure Rate: ≥ 30 s-1/nC·kg-1·h-1

3. Energy Threshold: 40 keV

4. Stability Error: ≤ 5%

5. Device Linearity: ≤ 10%

6. Accuracy: Measurement accuracy of Gamma-Ray: ≤ ±5% Positioning accuracy of GPS: ≤ 10m

7. Power: Battery: Use four Ni-MH Batteries

Power Consumption: ≤ 700 mW (≤ 900 mW with GPS)

8. Operating Environment:

Environment Temperature: (-5 ~ +50)°C Relative Humidity: ≤ 95% (40°C)

9. Alarm Threshold: Numerical control (NC) adjustable

10. Measuring Time: Selectable in 3s to 9999s

11. Maximum Storage Capacity: 120000 measuring data

12. Dimensions: Long Type: (673×51×230) mm

Short Type: (371×51×230) mm

13. Weight: Long Type: 1.4 kg

Short Type: 1.2 kg