Dfr-p-260gn series pedestrian radiation monitoring system is mainly used to monitor whether pedestrians contain excessive radioactive substances. The monitoring system is equipped with plastic scintillators and standard pressure He-3 medium pressure tubes (pressure can be selected). It has the characteristics of high sensitivity, low detection limit and rapid measurement, and can monitor various channels in real time. The effective prevention of illegal carrying and diffusion of radioactive materials is widely used in the radioactive monitoring and control of nuclear power stations, customs, airports, and stations. The monitoring system complies with the relevant requirements of the national monitoring system for radioactive substances and special nuclear materials (gbt24246-2009).

1.System standard configuration

γ Detection assembly: plastic scintillator + low noise photomultiplier tube
① Supporting structure: column and anti-seepage box
② detector collimation: 5-Sided ring lead box
③ alarm device: 1 set of audible and visual alarm for site and control
④ Management and control system: computer, hard disk, database and analysis software 1 set
⑤ transmission component: 1 set of TCP / IP transmission component
⑥ sensor: opposite infrared sensor

2. System (optional)

① neutron detection assembly: long life helium 3 neutron tube
② alarm capture system: 1 set of HD night vision continuous camera

1. Background ignoring Technology

The technology can quickly detect low-level radioactive substances under the condition of low radiation background, and the detection time can reach 100 milliseconds, which is suitable for rapid detection, and can ensure that the equipment will not give false alarm due to the sharp rise of the background; In addition, it can compensate for the reduction of background count caused by natural ray shielding when people and luggage occupy the space, increase the authenticity of inspection results, improve the detection probability, and especially help the detection of weak radioactivity;

2. Characteristic sigma statistical algorithm

Through the characteristic sigma algorithm, the detection sensitivity of the equipment and the probability of false alarm can be easily adjusted, and the sensitivity can be improved to detect extremely weak radiation sources (such as loss of radiation sources) when necessary; Or in the process of on-line monitoring in the end of the year, prevent the equipment from false alarm, so as to achieve the same reception and release.

3. 1017 counting long-life imported helium 3 neutron proportional counter tubes

The service life of the conventional helium 3 counter is about 1011 counts, and the service life of the life detector adopted by our company can reach 1017 counts, which is suitable for on-line radiation monitoring and long-term operation in the radiation field.

4. Networking function

The measurement data can be uploaded to the management center through the Internet for system supervision; It can be connected to the radiation detection application platform of the logistics monitoring subsystem of the General Administration of customs.