Alpha Background in Multi-Grid Neutron Detectors
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917519645736960 |
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| author | Backis, A. Lai, C. -C. Annand, J. R. M. Fissum, K. G. Zuzel, G. Czubak, M. Livingston, K. |
| author_facet | Backis, A. Lai, C. -C. Annand, J. R. M. Fissum, K. G. Zuzel, G. Czubak, M. Livingston, K. |
| contents | Alpha emission from actinide impurities in Al is a source of background counting rate in Multi-Grid type detectors of thermal neutrons. The alpha emission rates from samples of radio-purity Al and \mathrm{Al/B_{4}C} composite, used in grid construction, were measured on a large-area, low background spectrometer. Although the alpha emission rate from the composite was a factor \sim280 higher than radio-pure Al, \mathrm{25\:μm} Ni plating of the composite reduced the rate by a factor \sim1170. Background counting rates in two Multi-Grid prototypes were compared. They used identical configurations of \mathrm{B_{4}C}-coated, radio-pure Al normal blades for the grids, but the first employed radio-purity Al for the radial blades, while the second used Ni-plated \mathrm{Al/B_{4}C} on the radial blades. The background rate from the second prototype was around 20% of that from the first. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_22230 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Alpha Background in Multi-Grid Neutron Detectors Backis, A. Lai, C. -C. Annand, J. R. M. Fissum, K. G. Zuzel, G. Czubak, M. Livingston, K. Instrumentation and Detectors Alpha emission from actinide impurities in Al is a source of background counting rate in Multi-Grid type detectors of thermal neutrons. The alpha emission rates from samples of radio-purity Al and \mathrm{Al/B_{4}C} composite, used in grid construction, were measured on a large-area, low background spectrometer. Although the alpha emission rate from the composite was a factor \sim280 higher than radio-pure Al, \mathrm{25\:μm} Ni plating of the composite reduced the rate by a factor \sim1170. Background counting rates in two Multi-Grid prototypes were compared. They used identical configurations of \mathrm{B_{4}C}-coated, radio-pure Al normal blades for the grids, but the first employed radio-purity Al for the radial blades, while the second used Ni-plated \mathrm{Al/B_{4}C} on the radial blades. The background rate from the second prototype was around 20% of that from the first. |
| title | Alpha Background in Multi-Grid Neutron Detectors |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2605.22230 |