‘VY. APPENDICES
A.
1.
A METHOD OF ESTIMATING DOSES FROM FALLOUT ACTIVITY IN THE AIR
Doses to the Lungs
- Assumptions:
1.
The rate of inhalation is 20 cubic meters per 2) hours.
2.
The percentage of initial retention of particles (and activity) is 25%.
3.
Al) of the air-borne activity is associated with particles in the
respirable range.
4.
The. mass of the lungs, is 1000 grams and is uniformlyirradiated.
‘5.
Mean energy of the beta particles = 0.4 mev.
(The relative dose from
gamma emission may be roughly 10% of the beta dose.
Since. this is less
than the uncertainties in other estimations described below, it will not
be considered here.)
The dose rate decreases according to the relationship of (tine) “2. 2.
a.
it is recognizec that generally there will be higher volumes of
inteks thiring werSng hours than at other times. When such times
ere kncwn, aad a5S umiption usually made is that 10 cubic meters
ere inhaled during"8 hours of work and 10 cubic meters inhaled
> the rensinie> of the dey.
ade impactor data has shown 80 - 90+% of
@ t
une activitr nas been associ.ted with particles 5 microns or
=25S in size. However, it is quite possible that the high volume
a=> samplers in uszé collect
mn
“FA
sas
isan |
larger siege particles,
ngs is smalier but lixewise is the rate
wa
a
s
a"
2
s 4,
~!
Sy
2%
’
-37-
rm
6.