Abstract
A comparison of the various source characteristics, in particular the available fluxes of radiation in the X-ray/γ-ray region from (1) high power rotary anode X-ray generators, (2) radioactive γ-ray sources and (3) high energy electron storage rings will be presented. Some of the specific characteristics and possible applications of synchrotron radiation as a source will be discussed in detail, together with problems associated with the monochromatization of the continuous radiation in the X-ray/γ-ray region. The new high energy machines PEP at Stanford, the 8 GeV storage ring CESR at Cornell and the PETRA storage ring in Hamburg, which will soon come into operation provide a spectrum of high intensity radiation reaching well above hv photon = 100 keV. Thus e.g. at the PETRA e + − e − storage ring with E = 18 GeV and an electron current of 20 mA a photon flux of 8 × 10 10 photons/s · eV · mrad 2 of highly collimated and pulsed radiation will be available at the critical photon energy ϵ c = 75 keV. We will also discuss briefly the possibilities of using ondulators (wigglers), and laser-electron scattering for constructing high repetition rate tunable γ-ray sources. Finally we mention the potentials of using the powerful spontaneous emission of γ-quanta by relativistic channeled particles.
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