Development of the quality assurance/quality control procedures for a neutron interrogation system

Obhođaš, Jasmina; Sudac, Davorin; Valković, Vladivoj (2016) Development of the quality assurance/quality control procedures for a neutron interrogation system. IEEE Transactions on Nuclear Science, 63 (3). pp. 1544-1550. ISSN 0018-9499

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Official URL: http://ieeexplore.ieee.org/document/7470519/?reloa...

Abstract

In order to perform Quality Assurance/Quality Control (QA/QC) procedures for a system dedicated to the neutron interrogation of objects for the presence of threat materials one needs to perform measurements of reference materials (RM) i.e. simulants having the same (or similar) atomic ratios as real materials. It is well known that explosives, drugs, and various other benign materials, contain chemical elements such as hydrogen, oxygen, carbon and nitrogen in distinctly different quantities. For example, a high carbon-to-oxygen ratio (C/O) is characteristic of drugs. Explosives can be differentiated by measurement of both (C/O) and nitrogen-to-oxygen (N/O) ratios. The C/N ratio of the chemical warfare agents, coupled with the measurement of elements such as fluorine and phosphorus, clearly differentiate them from the conventional explosives. Here we present the RM preparation, calibration procedure and correlations attained between theoretical values and experimentally obtained results in laboratory conditions for C/O and N/C ratios of prepared hexogen (RDX), TNT, DLM2, TATP, cocaine, heroin, yperite, tetranitromethane, peroxide methylethylketone, nitromethane and ethyleneglycol dinitrate simulants. We have shown that analyses of the gamma ray spectra by using simple unfolding model developed for this purpose gave a nice agreement with the chemical formula of created simulants, thus the calibration quality was successfully tested.

Item Type:

Article

Uncontrolled Keywords:

Calibration procedures; QA/QC; container inspection; neutron interrogation; threat material analysis; threat material simulants

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Experimental Physics

Projects:

Project title	Project leader	Project code	Project type
Razvoj i primjene nuklearnih analitičkih metoda-	Jasmina Obhođaš	098-0362975-2881	MZOS
RAZVOJ METODA KONTROLE PROMETA OPASNOG MATERIJALA-	Dario Matika	098-0362975-2891	MZOS

Depositing User:

Jasmina Obhođaš

Date Deposited:

25 Oct 2016 14:04

URI:

http://fulir.irb.hr/id/eprint/3088

DOI:

10.1109/TNS.2016.2521900