ALFENDIX&
Assune:
a.
b.
FPotnt source
O.5 Mev averege beta energy
.
w 1) ear?/gm
Rate af decay follows grt?
The dose del! vered at the surface of an {raginary sphere at distance
R from a point source.
(2) x(n) =e? a
gran
where
XK(R) = dose delivured at the surface of an
imaginary wphere at distance F
x
C
ps
|
Substituting ys° se
Thens
average energy of beta particles
total mumber of disintegrations
mass absorption coefficient
v
(2) E£(R) = 0.37 re— Me
dis(atagret
goe
or
RX
—
(3.0.)
6.85
,
K(R) = OB x 107° 2
or
6.35
ailiirezs
ble ntegrat ion
-
(3.b.) K(k) Spee xo grF
RK
di«interration
Equation (3.a.) i» plotted an the at-ached graph.
{
FCR FISSICN PRCOUCT:,
f°
(5) dem 4,
pT
-
_
7
-
~1.2
where:
4
4, = disintegrations per imit tine at time "a" after detozrat'
4, @ disintegrations per unit tine at one unit of tire after
detoustion
oo
®rossi, HH, anid yltis, RN. "Dietritute’ Heba “ourves in Uniformly
4s
Pa
Fedia"
Rucjeogie:
Jule 1750, ¥. 7
.
Absorbing