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The inspection system ST-2630L represents itself a system for inspection of cargo, transported in vehicles, with the aim to detect prohibited enclosures such as weapons, ammunition, explosive substances, drags and fissile materials. Operation of the system is based on the use at scanning the high-energy bremsstrahlung with high penetrability that allows receiving on a monitor a high quality radioscopic image of inspected vehicles and transported goods, including construction materials. The system provides inspection of whole cargo, transported in cars, buses or freight vehicles (regardless of location place of prohibited enclosure and stocking density of cargo). A distinctive feature of developed equipment of the system ST-2630L is its principally new functional abilities for determination of physical structure of transported cargo that considerably facilitates operator’s work and increases effectiveness of inspection. Usage in the system a klystron-based electron linear accelerator with duplet energy modulation together with an innovative method of duplet pulse detection (Russian Patent No. 149560 priority from 10.07.2014), and also with special algorithms of scanned data processing allows reliable discrimination of at least 4 groups of materials by their effective atomic numbers (Zeff) and mass evaluation of cargo. Technological equipment of ST-2630L is located in a light construction of sandwich panels, its radiation safety in accordance with the requirements of SanPiN 2.6.1.2369-08, OSPORB-99/2010 and NRB-99/2009 is provided by optimization of radiation-physical parameters of bremsstrahlung source and by concrete shielding protective wall in the radiation direction and portable mesh fencing. |
| RADIATION SOURCE – ELECTRON LINEAR ACCELERATOR |
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| Electron beam energy | 6 / 3.5 MeV |
| Maximal dose rate at the accelerator output | 0.4 Gy/min at 1 m |
| Pulse repetition rate | 2x200 Hz |
| Image quality | |
| Penetration in steel | 320 mm |
| Steel wire detection with diameter: | without barrier – no more 0.8 mm |
| behind 100 mm steel barrier – no more 1.5 mm | |
| Contrast sensitivity at half of maximal penetration | no more 1% |
| Number of discriminated by Zeff groups of materials | 4 |
| Mass thickness of effective material discrimination | from 5 g/cm2 to 80 g/cm2 |
| THROUGHPUT AND OVERALL DIMENSIONS | |
| Throughput | up to 25 vehicles in hour |
| Maximal dimensions of vehicle, m | 20×3.0×4.5 (LxWxH) |
| Radiation safety | |
| Maximal dose absorbed by an object in one scanning | lesser 2 μSv |
| Annual dose for operators and population | lesser 1 mSv/year |
| Maximal accumulated dose at 10 cm from outer surface of fencing of the restrictive access zone |
lesser 1 μSv per hour
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| detection system | |
| Scanning height | 4.8 m |
| Total number of detectors (Г-like detector line) | 1312 |
| ADC capacity | 24 bits |
| computer system | |
| Software |
Linux(Windows)-based |
| Basic functions of image analysis |
Automatic and manual Image contrast control, histogram equalization, gamma correction, dynamic manipulation of grayscale for whole image and its parts at operator choice, sharpening, filtration, markers, pseudocolor, discrimination of 4 groups of materials by their effective atomic numbers (Zeff), mass evaluation of cargo. |
