Pyrolytic graphite as a selective neutron filter
The transmission of neutrons through pyrolytic graphite (PG) crystals, set at different angles with respect to incident beam, were calculated using an additive formula. A computer program HOPG was developed to provide the required calculation. An overall agreement between the calculated neutron tr...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Institute for Nuclear Research, National Academy of Sciences of Ukraine
2006-12-01
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| Series: | Ядерна фізика та енергетика |
| Online Access: | http://jnpae.kinr.kiev.ua/18(2)/Articles_PDF/jnpae-2006-2(18)-0135-Adib_fin.pdf |
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| Summary: | The transmission of neutrons through pyrolytic graphite (PG) crystals, set at different angles with respect to incident
beam, were calculated using an additive formula. A computer program HOPG was developed to provide the required
calculation. An overall agreement between the calculated neutron transmissions through a slab of 1,85 mm thick PG
crystal with an angular spread of c-axes of 0,4°, set at different angles to the incident beam, and the available
experimental ones in the wavelength range from (0,02 to 1,4) nm were obtained. A feasibility study for use of PG
crystal as an efficient second-order neutron filter is detailed in terms of crystal thickness, angular spread of c-axes and
its orientation with respect to the neutron beam. It was shown that a PG crystal with an angular spread of 0,8° is
sufficient for optimum scattering of second-order neutrons in the wavelength band (0,384 - 0,183) nm, by adjusting the
filter in an appropriate orientation. |
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| ISSN: | 1818-331X 2074-0565 |