abouc 30,000 meters.
In either case the half-thickness is roughly proportional
to the third power of the photon energy.
Bence, at Teak altitude, X-rays pere-
trate to an extent sufficienr to hswe a direct effect om materials expos.d muy
thousands of feet from the burst point.
This effect is expected to be quite
severe for an intense beam of soft I-rays, sicce it becomes absorbed in 2 surface
thickness of a few microns is wost dense materials.
Thus X-ray damage potectial
has produced much interest in the X-ray yield of muclear varbeads. ‘There are
Jk
p
,
certainly situations where the X-ray yield of a dewice would hawe a strung influence ow its effectiveness as an anti-ICEM warhead.
(b
After emission frow the case, the X-rays propagate to the measuring stations
with consequent absorption in the intervening air as well as absorption in the
detector filters.
Energy E of X-rays reaching the unit ares of the calorineter
surface is
2
0) p,(r)dr- (4.0 P2e£,%3(P)0535) seca]
E =» cos F
¥(0) e
ap,
es;
77.
HBand 4%
/ oe deleted.
(2.1)
,