[en] The device comprises a common gamma source, located on one side of the concrete block to be examined on the opposite side, a detecting unit comprising a collimator and a photo-multiplier detector connected to a display unit and moving along rails parallel to the concrete block face. That device is used for displaying concrete defects in particular injection deficiencies in the pre-stress sheaths of concrete used for the building of bridges or tunnels

[en] The lecture traces gamma radiography from its inception by Robert Mehl in 1928 to 1941. The lecture was presented at the first and organizational meeting of the American Industrial Radium and X-Ray Society, Inc., at Massachusetts Institute of Technology on Oct. 17, 1942

No abstract available

[en] A radiography apparatus attachable to the exterior surface of an object which is to be radiographed where the exterior surface is underwater is described. (U.S.)

No abstract available

[en] The apparatus and a method for the inspection of tubes in a steam generator include a film-bearing cassette probe insertable into a target tube to a predetermined region to be inspected and a source of radiation, preferably a radioisotope, insertable into a tube adjacent the target tube to a position laterally adjacent the region to be inspected on the target tube. The cassette probe is sufficiently flexible to transit regions of tight tube curvature. 8 claims, 12 drawing figures

[en] A device is suggested for defectoscopy based upon gamma-translucency. The defectoscope involves a protective container with a curvilinear channel for the radiation source and a flexible directing ampule conductor with a rope. At the end of the rope there is an ampule with the radiation source and a drive for the rope displacement along the conductor. To reduce the displacement force the defectoscope has a vibration device, which supplies low frequency oscillations to the moving rope in the plane normal to the displacement direction. The scheme of the rope displacement drive is given

[en] Because of its practical aspect digital radiography is more and more used in the industrial sector. There are 2 kinds of digital radiography. First, the 'computed radiography' that uses a photon-stimulated screen, and after radiation exposure this screen must be read by an analyser to get a digit image. The second type is the 'direct radiography' that allows one to get a digit radiograph of the object directly. Digital radiography uses the same radioactive nuclides as radiography with silver films: cobalt, iridium or selenium. The spatial resolution of digital radiography is less good than with classical silver film radiography but digital radiography offers a better visual contrast. (A.C.)

No abstract available

[en] Described is the design and performance of a 40 channel gamma defectoscope. Each channel includes a radiation defector, recording unit and a self recorder. The apparatus operates automatically according to signals from the control unit on the basis of analogo-numerical circuit-technique. A logarithmic regime of tarningin of the photoelectron multiplier FEhU-82 is used