THE ENERGY SPREAD OF SOME RADIATION-FIELDS USED IN ACTIVATION-ANALYSIS

The global results of the activation process are generally dependent o f the activated material, type of nuclear reaction, energy of incident particles, etc by means of some specific parameters (cross section, f lux density, etc.). To characterize the above mentioned process, the e nergy behavior study of the radiation fields generated by extended sou rces can be useful. In this paper, the energy spread in nondispersive media of some exoergic nuclear reactions (i.e., d-D, d-T reactions at low energy excitation levels, etc.) lodged in axi-symmetrically emitti ng disk-shaped sources, used as radiation sources in activation analys is, have been investigated analytically. The contribution of the first terms of an angular depending series approximation is underlined. Com putationally tractable expressions, in terms of elementary and ellipti c integral type functions, are proposed.