2(0,,x) for sphere 
Ss for sphere 
Constant-s contours, sphere 
s(8y,8,) 
FIG. 1. Quantities needed for evaluation of radiation from 
neutron-activated sphere. Z(bn,x) is plotted as a function of x 
for different values of the parameter B, (see table of symbols). 
2(,,x) for slab 
s for slab 
Values of s(B,,B,) are plotted as funcfions of B,, B, being the 
parameter. Contours of constant s are shown on a map of By, 
and B, 
Constant-s contours, slab 
s(8,,8,) 
=o 
(e} 
FIG. 2. Quantities Z(b,,x) and s and contours of constant s that 
are used to determine radiation from irradiated slabs are dis- 
° 
° 
nN 
° 
Py 
° 
a 
° 
@ 
re) 
& 
played in same manner as those for sphere that are displayed 
above in Fig. 1 
Symbols 
a = significant length (radius of sphere, half-thickness of slab) 
za = distance from center of sphere or midplane of slab to vol- 
ume element 
ha = distance from volume element to surface element 
uw = absorption coefficient 
n = subscript referring to neutrons 
r = subscript referring to induced radiation 
b = pa 
B=1-e> 
b(1+2) 5 ' 
E= he ) e~¥ dy/y = Ei(—b(1 + z)] — Eif[—bd(1 — 2)) 
Lol 
@ = neutron flux (n/cm*/sec) 
got = integrated neutron flux (n/cm*) 
Z(ba,x) = distribution function for induced activity 
= iE en cos 6 dS /4rh?a2 
p = actual volume density of radioactivity (dps/cm’) = puadtZ 
o(Bn,B,) = surface density of radioactivity of equivalent thin 
shell (dps/cm*) = iE erhp(Ba,xz) cos 6 dV /4rh?a? 
8(B,,B,) = ratio of equivalent-surface activity to total induced 
activity 
= I, ods / fpeav = SavgS/PavgV 
Beets: L, o dS/S 
pon = fe av/V 
Zag a Pavg/Ungt 
227 
