Threshold sensitivity of an X-ray image tube to 1 MeV bremsstrahlung

Sensitivity threshold of an X-ray image converter tube with a microchannel plate as a converting and amplifying element when taking images on a photographic film is investigated. 1 MeV bremsstrahlung radiation formed in absorption of a relativistic electron beam at a target served as a source of X radiation. Experiments were carried out with both a 1 mA continuous beam (EhLV-4 accelerator). In the first case the threshold sensitivity equalled a few tens of μJ/cm2 and -about 1μJ/cm2 in the second one. 9 refs.; 1 fig