Soil Radon Detector

Application field

Measurement of volume activity of radon in ambient air, soil, water, and surface radon release rate in soil, building materials, etc. It can be used for environmental monitoring, geological exploration, radiation protection, nuclear accident monitoring, radiation dose evaluation, earthquake prediction, and teaching.

The instrument complies with:

GB 50325-2020 "Standard for Indoor Environmental Pollution Control of Civil Building Engineering" Electrostatic Collection Semiconductor Sensor - Alpha Spectral Analysis GB/T 14582-93 "Standard Measurement Method for Radon in Environmental Air" T/CECS 569-2019 "Standard for Radon Detection Method in Indoor Air of Buildings"

The measurement principle and requirements.

Instrument Features

Exquisite, lightweight, and portable: The external dimensions are (275x220x167) mm and the weight is 2.5kg.

Advanced, accurate, and reliable:

The HM-CD2 intelligent environmental radon measuring instrument is an electrostatic collection semiconductor sensor alpha spectroscopy radon measuring instrument. By pumping the measured gas (air) into the electrostatic collection chamber, the first generation decay product RaA (218Po) of 222Rn is adsorbed onto the surface (cathode) of the semiconductor alpha ray sensor through a high-voltage electric field. Through energy spectrum analysis, the alpha particle count rate of RaA is measured, and the volume activity of 222Rn is quantitatively measured.

The energy spectrum measurement of alpha particles with a short half-life of 222Rn (218Po half-life of 3 minutes) may effectively solve the interference of thorium gas in soil radon measurement. At the same time, due to the short half-life of the measured daughter, the detector can recover to a low background state in a relatively short time when measuring high activity (such as soil radon).

Equipped with a built-in climate sensor, it can accurately measure the gas temperature, temperature, and atmospheric pressure inside the electrostatic chamber, used to indicate the status of the dryer, correct gas volume, and adjust temperature adsorption rate.

Intelligent and user-friendly:

The HM-CD2 intelligent environmental radon measuring instrument adopts an intelligent touch platform based on ARM processor and Android 4.4 system to complete data acquisition, processing, display and printing, which makes the PRn700 series intelligent environmental radon measuring instrument have multiple intuitive and friendly human-computer interaction modes such as image, sound, wired/wireless network, touch sensing, etc.

The computer platform based on ARM processor and Android 4.4 operating system has powerful data processing capabilities, WIFI、 Rich data connection modes such as Bluetooth, USB (HOST  DEVICE mode), RJ45, RS232, etc., supporting users to update software. The software design of intelligent backlight, automatic shutdown without tasks, and key operation confirmation conforms to the mainstream operation mode of intelligent touch devices. The product is easy to operate, and users can correctly operate the device after a short period of simple exploration. Handheld Bluetooth printer, self-adhesive report label. One click printing, tear and stick to complete data saving. The host can provide charging services for the printer, avoiding the embarrassment of having nowhere to charge the printer in the field!

Supporting facilities and complete functions:

Equipped with various professional accessories for measuring radon activity in soil, building materials, water, etc. Mature and reliable technical solutions, highly integrated platforms, and mature software environments make the device structure compact and the performance more reliable

Main technical specifications of the instrument: 

1. Electrostatic chamber: volume 700ml, high voltage of electrostatic field 2500-3000V;

2. Detector: Semiconductor planar silicon detector with an effective detector area of 572mm2; The energy measurement range of alpha particles is 0-10 (MeV), with an energy resolution of 37 KeV (FWHM);

3. Background count rate: ≤ 0.003cpm;

4. Detection sensitivity: 0.2 cpm/pCi/L;

5. Detection limit: ≤ 1Bq/m3 (120min, 2 σ);

6. Measurement range: 0.1~25000 pCi/L (3.7 Bq/m3~925000 Bq/m3);

7. Measurement uncertainty: ≤ 10% (k=2);

Measurement range:

Air radon: (1~999999) Bq/m ³;

Soil radon: (300-999999) Bq/m ³;

Radon in water: (0.001-10.00) Bq/L;

Radon release rate: (0.001-1000.000) Bq/[m2 • s];

8. Annual displacement of volume activity response: ≤± 20%;

9. Relative inherent error: ≤± 20%;

10. Power supply: Lithium ion charging battery: 11.1V, 5400mA/h. Charger input: AC (110-240) V, output: 12.6V/2A;

11. Working environment temperature: (5-40) ℃ Humidity: ≤ 90% RH;

12. Display: 5.5-inch 5-point capacitive touch LCD screen;

13. Gas extraction method: active pump suction, pumping rate: 2L/min (no vacuum load);

14. Measurement time (under typical conditions): air radon: 20-120 minutes, soil radon: 9-17 minutes, radon release rate: 60-300 minutes (excluding gas collection time);

15. Size: (330 × 210 × 170) mm;

16. Weight: 2.5kg (including equipment protection box, filter, charger);

17. Climate sensor: Temperature: Measurement range (0-50 ℃), accuracy ± 0.5 ℃; Pressure: Measurement range (300-1100)

Note: The above parameters are only general parameters, and there may be special requirements for a specific device. Please refer to the contract or bidding documents for accuracy=

Instrument configuration:

1. One intelligent environment radon measuring instrument host;

2. One pipeline dryer;

3. One charger;

4. One filter;

5. One set of soil gas gathering drill rods (one for drilling and gas extraction);

6. One portable Bluetooth printer;

7. One set of radon release rate measurement accessories (optional);

8. One set of radon measurement accessories for water (optional);

9. One instrument calibration certificate;

10. One copy of the inspection certificate of conformity;

11. One user manual;

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