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| English | Russian |
| useful beam | полезный пучок (of an irradiator, also an X-ray machine) |
| useful beam | используемый пучок (of an irradiator, also an X-ray machine) |
| useful beam | полезная часть пучка (of an irradiator, also an X-ray machine) |
| useful field | полезное поле (излучения) |
| useful life | ресурс (of a detector) |
| useful life | полезный срок службы (of a detector) |