| Autor: |
P. Martin, J. O'Malley, C. Hill, Ben Campbell, Ceri D. Clemett, J. Threadgold |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Physics Procedia. 66:206-215 |
| ISSN: |
1875-3892 |
| Popis: |
This paper explores the benefits of using a mixed photon and neutron radiation source for active detection of special nuclear material. More than fifty irradiations were performed using an 8 MV electron accelerator employing and induction voltage adder (IVA). The experiments used a high atomic number converter to produce a Bremsstrahlung photon spectrum which was then used to create a neutron source via a nuclear interaction with heavy water (deuterium oxide, D2O). This mixed particle source was used to irradiate a depleted uranium (DU) sample, inducing fission in the sample. Several thicknesses of steel shielding were tested in order to compare the performance of the mixed photon and neutron source to a Bremsstrahlung-only source. An array of detectors were fielded to record both photons and neutrons emitted by the fission reactions. A correlation between steel shielding and a detection figure-of-merit can be seen in all cases where the Bremsstrahlung-only source was used. The same relationship for the mixed photon-neutron source is less consistent. The data collected from the fielded detectors is compared to MCNP6 calculations and good agreement is found. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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