| NOUN | artifact | boron counter tube | a proportional counter tube for counting neutrons |
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| Meaning | A proportional counter tube for counting neutrons. | |
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| Parts | boron chamber | An ionization chamber lined with boron or filled / filled with boron trifluoride gas for counting low velocity neutrons |
| Broader | proportional counter tube, proportional counter | counter tube whose output pulse is proportional to number of ions produced |
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