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30.6.2008

Prof. dr. Vladivoj Valković (A.C.T., Zagreb, Hrvaška) bo imel 15. 7. 2008 ob 11:00 v predavalnici MPŠ predavanje z naslovom DETECTION OF THREAT AND CONTRABAND MATERIALS.

 

DETECTION OF THREAT AND CONTRABAND MATERIALS

Vladivoj Valković
Analysis & Control Technologies (A.C.T.), Zagreb, CROATIA

Threat to the security of people living anywhere on the globe can come from:
-Smuggling of sizable amounts of explosive (may-be in combination with radioactive or toxic element/compounds) preferable in the sea containers, tankers, trucks, etc.
- Huge amounts of explosives in the soil – landmines.
- Large amounts of the explosives and chemical warfare on the sea bottom.
It is very difficult to find out threat materials (explosive, chemical warfare,...) since they are usually contained within a small volume inside variable complex matrices. Large volumes prevent the proximity of sensor to the investigated material; large amounts of matrix material around the investigated object generate huge backgrounds.
Therefore, any analytical technique to be applied has two assignments: penetration in (with a probe signal) and out of the matrix (with signal from the object). In addition, cross section for the process needs to be sizable (large). Nuclear analytical techniques are good candidates since they can be employed with electromagnetic radiation and charged or the neutral particles being both probe and detected signal.
Although there has been some reported progress in many systems (gamma in – gamma out, neutron in - neutron out) the most promising seems to be the use of tagged fast neutrons generated in d+t→α+n (Q= +17.6 MeV) nuclear reaction. Among others, EU – FP6 project EURITRACK has been a successful demonstration of the use of tagged neutrons for ship container inspections. It has been shown that the deployment of the same technology under-water is a feasibility to be realized in the near future (i.e. EU-FP7 project UNCOSS).