Abstract
1. The scintillation radiation method is very effective in detecting hidden defects in timber supports for mine workings. 2. The best gamma quantum energies for irradiating pit props are those from 100–400 keV sources. 3. By means of radiation “defectoscopes,” which are described above, we can carry out industrial control. The speed of this operation is higher if we use low-inertia recording devices, such as oscillographs.
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