d
APPENDIX #
CALCULATIONS
Gacma Dose Rate from a Field Six Inches in Radius and Chander
a
~—.,
a
Canter of
Four
-
|
incies Aove Surface
ad
Dose rate of gamma froz @ point souree
r26cy where: r = r/or
C= activity in curles per square foot
Fs average energy of gamas (Hey)
Qr -
6CE. 2 7f
heyxe
-
6
h2/x2
Frarples
Lets
_——
-
~°
x 1/2 feet
€ 2 LO
F = 0.7
pe/em? or 3,6x 107? ef/rt?
Her
h = 1/3 foot
(gasaa)
2
oye
«= 0,56 rfhr
De
-
.
Comparison Gasca Dose Pates From Infinite Plane at a Feiget of Three Fect
~~-
A ove the Ground to Area of Six Inch Radius asd Heig:t of Four Inches,
Assume:
1 megacurie/mile®
(3.6 x 10-2 o/ft2)
b.1 rie = 7.3
0,56
r/ur
‘s
x a
Res
Wa
8
ef
pe
'
.
.
* .
'
, SE
meet T= OS—