Abstract
A multilayer foil was devised for use as a detector of fist neutrons in a reactor and is an extension of Hurst's method using gammas from Np/sup 237/ fission. but it has the advantage of making Hurst's B/sup 10/ shield for Np/sup 238/ gamma activity unnecessary. The foil is comprised of a thick nickel foil, layer, a 7-mg/cm/sup 2/ aluminum catcher, an aluminum control layer, and 30 mils of cadmium. The 0.3-mg/cm/sup 2/ aluminunn liver trips the Np/sup 238/ recoils from the neptunium (n, gamma ) reaction while allowing 90% of the fission products to pass into the aluminum catcher. The aluminum control foil restrains the activity from the Al/sup 27/(n,p) reaction. In order to test the foil assembly for masking the Np/sup 238/ activity, 10-min, 3-day, and 7-day irradiations of Np/sup 237/ in a graphite reactor were carried out and compared with a thermal neutron irradiation of Pu/sup 239/ using Hurst's techniques; agreement is found to be excellent. (D.L.C.)
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