BREMSSTRAHLUNG FORMATION IN THE DUAL ENERGY METHOD FOR RADIOGRAPHY OF THE UNAUTHORIZED EMBEDDING
Abstract
The possibility of an effective method of dual-energy radiography unauthorized inclusions containing heavy elements in cargo containers has been investigated. A method for optimizing the energy performance of the bremsstrahlung radiation: low-energy beam (containing the maximum number of photons in the energy range, which is dominated by Compton effect) and high energy beam (with a maximum number of high-energy photons, electron-positron pairs) has been developed. The influence of the converter thickness and converter material on the spectral characteristics of the beams of photons has been investigated. The variants of treelayers efficient converters have been proposed. On the basis of the Monte Carlo and quasi-analytical method a numerical experiment radiography investments has been completed. It is shown that the use of optimally shaped beams can reliably distinguish embedding
from lead to masking the background of steel structures up to 25 cm
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References
Neale W., Rushbrooke J., Ansorge R. // 1996, US Patent, 5,524,133.
Ogorodnikov S., Petrunin V. Processing of interlaced images in 4–10 MeV dual energy customs system for material recognition //Phys. Rev. Special Topics - Accelerators and Beams. – 2002.– Vol.5. – P.104701.
Broder D.L. i dr. Rukovodstvo po radiacionnoj zashhite dlja inzhenerov. - T.1. - M.: Atomizdat, 1972. - 424 s.
Storm E., Israel H. Photon Cross Section from 0.001 to 100 MeV for Elements 1 through 100, Los Alamos Scientific Laboratory, New Mexico, 1967.
Hubbell J.H., Seltzer S.M. // Radiation Physics Division, PML, The National Institute of Standards and Technology(NIST), USA, http://www.nist.gov/pml/data/xraycoef/
Baro J., Sempau J. at all. PENELOPE: an algorithm for Monte Carlo simulation of the penetration and energy loss of electrons and positrons in matter //Nucl. Instr.& Meth. – 1995. - Vol. B100. - P.31-46.
Salvat F., Fernández-Varea J.M., Sempau J. // 2011, PENELOPE-2011. OECD NEA Data Bank/NSC DOC(2011)/5 (OECD Nuclear Energy Agency, Issy-les-Moulineaux), http://www.oecd-nea.org/dbprog/courses/penelope-2011.pdf
Meissner I., Abs M. at all. //Rad. Phys. Chem. - 2000. - Vol.57. - P. 647-651.
Afanas'ev V.D., Pis'meneckij S.A., Rudychev V.G., Rudychev D.V. Primenenie metoda dual'nyh energij dlja diskriminacii tjazhelyh elementov // The Journal of Kharkiv National University, physical series “Nuclei, Particles, Fields”. – 2005. - No. 664. – Iss. 2(27). - S. 56-60.
MCNP 2.4.0. // 2002, RSICC computer code collection. CCC-715. ww.mcnp.ir/admin/imgs/1354175991.C715.PDF
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