apprinrx &
LATIONS
Of Beta Tose Rate at Popth of Seven Killigrams per
_ ~Square Centizeter From a Thin Jourtt,
”
5
Assumes
1.5 Mev 7eta (Mean energ; = 0.5 Rev)
F,= 10 en?/em
(Tis sesmes & single mass acsorption coefficient.)
I= Bo oe}*
wheres Bo = numer of tetas at surface per cx? per sec.
Hoe
©
8
© ¢epth x
Fe mass @porption coefficient
x= distance (depth) under consideration
di
=7=
|
F ho o*
.
R@ pkoe"<r
2
were: R= dose rate at dept. X
Fm mean encrgy of ‘etas ,
n= (10)o en (065) © 2.33 Bo Hev/gn~sec.
Ho = 3.7 x 1
were: C = activity in elerocurles per oF
R= 8,65 x 104 Rev/cr-sec.
Be (1,39 x 10-1)(C)erzs/em-see
= 5.k C reps/Ay
or
@&5.0C renal)
&
‘le
Agsme:
C= 80 pe/ce®
R=5.h6
= (55h )(80)
or
=
(beta)
where: Re Gate ratetp een 7 ne/om® in reps
c== activity/cn?"in pe
r
= 100 rata/ar
Cormarison eta Nose Rate(Peps/cr)at 7 Er/ex
Ca-maLose Rate Keasured tn Infirite Fiela at a ree
“
Feet Aovethe’ Surface© oe eee
a
Asse:
PusUEtf
rn =
80yefen® (seta), equivalent to
1 megacurie/nt? (¢acs)
L32
~ 100
“ar
on.
9"
CR