“…The layouto( a reactor with such a secondary shield arrangement is shown in APAE 63. 406 [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] .~ where an oxygen nucleus captures a fast neutron, transforms into 7 N 1 6 nucleus and decays by Jj. emission with a characteristic half-life of 7.35 seconds.…”