[en] The picture quality is improved by the camera being a TV camera with such a large dynamic extent that the noise level with the greatest amplification of the input signal is less than 0.5% of the output signal. (orig./HP)

[en] The irradiation test equipment has a picture converted for the radiation passing through the objects. The screen of the picture converter is observed by a TV camera. In order to improve the picture quality, the picture system between the screen and TV camera is provided with two tandem objectives. The equipment complies with the quality criteria of DIN 54109. (DG)

No abstract available

[en] This paper provides a brief summary of several developments of new radiologic systems for nondestructive material testing which have occurred during the last five years

[en] An efficient, accurate, and stable solution to the electron transport problem is presented. The two-stream approximation is discussed in detail, but the solution is developed for the general multistream case. Applied to the photoelectron problem, it is shown that accurate escape fluxes are obtained using only 10 altitudes distributed over the region 100 - 1,000 km. The local equilibrium, two-stream, and multistream solutions to the photoelectron problem are compared. In addition, a recursion relation for the moments of the elastic angular scattering phase function is presented

[en] Radiography enjoys a specific situation within non destructive testing. The author presents recent developments in this field like radioscopy using fluoroscopic screens or X-ray image amplifiers, radiometry, radioscanning, and in computed tomography. (HP)

No abstract available

[en] Gammametric testing in connection with modern computer technique results radiographic images of quality class I. The gammametric method is a well known technique in nondestructive testing. A narrowly defined X-ray or a gamma ray beam traverses a workpiece and is recorded by a gamma radiation detector. As the radiation is attenuated in the specimen, changes of its intensity may indicate discontinuities in the material such as flaws, inclusions or cracks. This commonly used method suffers from the disadvantage that no two-dimensional image is obtained as in radiography or radioscopy, but always a transmission curve of a linear section of the workpiece, yielding a quite difficult interpretation of the measurements. For this reason the gammametric method has been restricted to some special application, such as the inspection of very thick walls or for performing very accurate measurements

No abstract available

[en] In this paper, the phase two-form of Berry in the neighborhood of a degeneracy of the Fock vacuum of a semisimple, nonabelian, second-quantized, relativistic fermion-background gauge field Hamiltonian is shown to be that of the Dirac magnetic monopole - thus extending a result of Berry to field theory. The Dirac Hamiltonian for an SU(2) fermion on the two-sphere is solved in a particular two-parameter family of background instanton gauge potentials as an explicit illustrative example