eee
EUS
EAT
S
ee
“BY a, 75k
ANNEX TI?
valculatigns of “ose late at Three “cet
cove A Flane uurface
ver point source (0.3 - 3.0 Kev range)
Oeee
6
i
ma mo
wheres
ii
Dose rata ({r/hr) 2 oS
activity (curies)
eneryy i. ev
distance in feet
eeee
cose rate = CfA OT ate
at
+ x
where: 4 = aotivity/anit area
bh 2 height adow sarface (feet)
¥ = distance in feet
Ry
“ose rate = GEA 27
«ote
- rene
%y
?
= 67 va ln 5S)
2
—
) ro gnt
ema ee
The mean free path for 0.7 Wew in atr is about 360 feet so that
essentially all of tne dose will be contributed from a surface 1,000
feot fa radius,
Let A= 10 x 10° cirtea/ft?
Aa Of Bev
tose rate = 677T0.7)(10 x Ir*} 2p
at!
3
fee
ar/hr
Simee Wile formila sesumes no adsorption and alse a uniform plane
surfae@, @ estinate is that
10
fog
pe/7t
-
oof
aro.f,