Abstract
‘True’ radiation spectra of 1.2 GeV electrons in thick single tungsten crystals (0.34 and 0.91 radiation length) have been measured with a new technique permitting one to exclude the spectra distortion through the multiplicity of gamma-quantum creation. It is shown that the dependence of radiation brightness on initial electron energy E 0, obtained in the tungsten crystal of 0.3 radiation length thickness at the collimation angle of about mc 2/ E 0, is fitted by the law E 0 3 in the energy interval 0.9–1.2 GeV. The radiation brightness at E 0=1.2 GeV in tungsten and silicon crystals of ‘optimal’ thickness has been compared with that in tungsten and germanium crystals of various thicknesses. The radiation brightness in the angle mc 2/ E 0 proves to be maximum for the silicon crystal. This confirms the conclusion that silicon crystals are more preferable for application in gamma converter.
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