ne
.
~li-
.
neutralized by the rrogressive radioactive decay.
ne
~
In addition the transit dose
frou the cloud pessing over the atolls could not be estineted,
variables were taken into account end the doses celculated.
All of these
These doses were
consistent with the doses that were actually measured on Rongerik by film that
was stored in refrigerators and by film exposed outside on this atoll.
In view
of this internal ccnsistency it is believed that the dose of radiation on the atolls
4s reasonably accurate,
Details of the calculation of the dose are in the official
report which discusses in detail the probable range in values (ref, 1, Chapter 1)
CEARACTERISTICS OF THE GAMMA R‘DIATION
The fellout material vhen deposited on the ground formed a large planar source
of radietion.
The energy distribution of the radiation reaching an e:pesed indiv=
idual is influenced by its passage through the intervening air.
A knowledge of the
tnherent gamma spectrum as it emminates from the meterial itself is essentiel in
order to determine the spectrum that inpinges upon exposed individuels.
When one
takes into account the spectometric data on the mixed fissicn products and the
degredation by Compton scattering along the path in air, a dose energy histogram
can be constructed, showing that there are roughly three regions with maxina at
10C, 700, and 15CO KEV.
The total exposure is thus the resultant effect of partial
doses from each energy region, making the exposure energy condition significantly
different fron those of radiation therapy, experimental biology or from the prompt
pooma raecdiation-of the bomb,
Details of the characteristics of the exposure are
diccussei in reference. (Ref. 1, Chapter 1).
TFE CHARACTERISTICS CF TYE FALLOUT MATERTAL
The fallout meterial consisted predominently of flakes of calcium oxide resulting froz the incineration of the ccral.
products were derosited.
as enow like,
Upon the flakes of calcium oxide fission
At Rongelap Atoll the material was visible and described
It stuck to the skin, adhered to the heir and clothes, the vegetation
BOE arcHives