| 摘要 |
The invention relates to the method for obtaining the mixture of stable nuclides of selenium-74 and germanium-74 of pure arsenic on the base of nuclear technology. The method is realized by the following procedure. A portion of arsenic in the solid (natural) state is placed to the central test channel of experimental reactor for irradiation with neutrons of reactor spectrum. At irradiation of arsenic As75 with thermal neutrons arsenic As76, is received from which as a result of ?-decay we obtain the nuclide of selenium-76 - Se76. To avoid artificial isotope of arsenic As76, the central channel where the arsenic portion is irradiated, is screened from thermal neutrons by the screens from cadmium and borer, and as a result arsenic As75 is irradiated only by the fast neutrons nB. At irradiation by fast neutrons nB of arsenic As75 the reaction (n,2n) takes place, and as a result is obtained arsenic As74 , representing +- ? radioactive nuclide with the period of half-decay of 17.5 days. 65 % decays of this nuclide produce germanium Ge74, and 35 % produce selenium Se74.
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