Sidorov Vasiliy Ivanovich RussiaSaratovSaratov State University, 410012, Russia, Saratov, Astrakhanskaya street, 83научный сотрудникserg@sgu.ru Author's articles Power Range of Photoneutrons from 209Bi at Е γmax = 12 MeV Nanostructured Porous Silicon Layers Formation at Low Doses of γ-Radiation