Wa as fission products. ov21620 The induced products have no effect on the value of a or ap in terms of fissions but do effect the value of I(t) in both contour ratios and on a and ap in other units of measure such as disintegrations per unit time. For a given composition of radionuclides deposited uniformly over an extended area of the ideal plane, the radi- ation intensity over the plane (say, at 3 ft) is given by I(t) = Go (t) a (t) (4) in which G2 (t) is e conversion coefficient for a(t) on a smooth infinite plane and whose value depends on the units of a(t). If a(t) is in d/s per sq ft, then G, (t) has the units r/br/(d/s per sq ft). If a(t) is in fissions per sq ft then (2 hes the units r/br/(fise/sq ft); in the latter units the parameter a does not depend on t. Values of G (t) for the fission products from several kigds pf fission have been calculated as a function of time after fission.“’~2" Keepin, the fission products and induced activities (capture products) separat: allows the seperation of G (t) into two parts so that G2 (t) = ip(t) + 1,(t) (5) in which ip,(t) is the value of the (r/hr)/(fission/sq ft) for the fis- sion products and Agp(t) in (r/br)/(fission/sq ft) for the capture pro- ducts is given by ete ee ip(t) = 2, e,i,(t) in which c, (6) is the number of neturon captures to form the jth radiomic- lide per fission (radioactive atoms produced per fission) and i,(t) is the radiation rate (r/hr) at time, t, after detonation from one‘radioactive atom (corrected to zero time) per sq ft. The total radioactivity produced by the device is given by 8, = KoW pOE/NY (7) in which W is the total nuclear yield of the device, b is the ratio of fission to total yield and K is a constant depending on the units of am ' a