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« Badlation
The Turteilent Diffusion
of the RadioactiveProducts
the
Ww. G Pemey
the purpose of this memrandm is to demonstrate thatthe
Fatiation hazards will be very considerahly mitigated by the turbulent
diffusion of the products dom into the water, The radiation hazards
fin Shot A my be anticipated mall after four hours and my even be
tolerable for short times at 2 hours,
Even in Shot B, the may be
amell im 12 hours axcept possibly for ships near in, ani dom wind.
the danger from radioactivity may be divided into two classes:
3 those avisirg from the fission products
Those arising from secondary radioactive products induced
4n the material structure of the ships.
/
Evidence from the Trinity experiment, ami from measuranents in
roehiom and Nagasaki, make it practically certain that (2) will be below
e aignificant level for beth shots,
With regard to (1) in Shot A, tw possibilities must be considered,
he first is that the flame region containing fission products will ex-
Agend over at least one ship and contaminate it by actual deposition.
ere it may be stated that ships which are this close will in all
probability sink. Therefore it is wmlikely that any ship which stili
d@loats will be contaminated by primry products, The seond represents
ie
mse
only serious possibility and is that the fission products will eon-
on the surface of the see directly, or be condensed on droplets
ch return to the surface of the sea.
With regard to (1) in Shot B, three possibilities must be con.
the second is eontamimtion of a ship hy wter drops containing
adioactive prodwts felling on the ship,
This appears a serious
eg ee eee adsen wand. Some trouble may be expected
these ships, The third is the spreading of the fission products crer
ee ceded
e
ett the volume of the vee within about 1500 fest
af the explosion center
y , ,
.
‘
co
We my suppose that in this shet the prodwte are initially
spread uniformly ever a certain area, estimated roughly at 1000 fest
radinue. Xf the produwts did act move, the radiation density above the
water surface in this area wuld be given by the accepted formila,
provided hy Neisskop#
poste ne
f COPIED)D0E
"LANL RG .
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R(per hour) = P 3200
Whours)
| n(kilotons)
m(sq miles)
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