h
158
THE SHORTER-TERM BIOLOGICAL HAZARDS OF A FALLOUT FIELD
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INTERNAL DOSE FROM SHORT-LIVED RADIONUCLIDES
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} year, and ft vear to 70 vears. These values
were obtained by summing the integration of
never did really get to him. I would like to
start the questioning by asking, Dr. Morgan,
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of Hunter and Ballou © were used in making
these calculations.
Table IV lists the relative hazards* in the
§ time intervals. The relative hazards were
muin_ permissible values caleulated on the
basis of the gastrointestinal tract? Do you
really fecl these numbers which, as 1 understand
it, will lowerair in water maximumpermissible
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values given in Tables ] and I]. Many voids
appear in Table 1V, especially in the case of
the 1 hour to 1 day interval because the MPC
values are not available for many shorl(lived
radionuclides. ‘The transuranic nuelides or
organs?
Dr. Morasan. Dr. Langham, 1 should be
asking you or Dr. Henshaw or one of the rest,
of this group this question, rather than you
asking me. The British on the International
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hazard because their availability depends upon
the type and efficiency of the weapon and the
elevation of the weapon at the time of detonation. However, their contribution to the
possible hazards of fallout must not he over-
tion between the permissible dose to the gastrointestinal tract and to other body organs. This
matter was discussed somewhat in our committee in the carly part of the week, and I
gathered from the discussion there that the
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the rate of radioactive decay of cach radionuclide over eachof the 5 time intervals. Data
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2833
obtained by dividing values of availability
given in Table IT by the single exposure MPC
the induced radioisotopes are not included in
these tables of relative availability or relative
looked.
data available
available in
in Table
§Summarizing
narizing the
the data
Table
IV TV,
the radionuclides presenting the major hazard
in each interval may be listed in order of
decreasing hazard as follows:
1 hour to 1 day - (insufficient data)
1 day to 1 week - 1", Ba™, La', Mo™
1 week to 1 month —I*, Ba™, Lal, Pes,
YY") Zp, Sr Colt
1 month to 1 year—Ce™, Zr", ¥", D4, Nb
Ba, sp
1 year to 70 years Sr, Cet, Cs, Ru
DISCUSSION
Commission from the start T think felt rather
strongly that we should not make anydistine-
consensus of opinion is again that we should
make anydistinction
with oneone exception.
excepti
not{ make
distinction with
In the case of alpha emitters, I believe the
National Committee feels rather strongly that
the alphas would not reach the mytotic layer
in the lower large intestine, and therefore would
not constitute a hazard. So with that one
exception, it is very Hkely in the revised handbook 52 that the gastrointestinal tract will
appear as one of the eritical organs in many
cases, with the exeeption of the alpha emi(ters.
As to whetheror not this is a safe assumption,
L would rather for you or Dr. Henshaw or some-
Karl Z. Morgan
Dr. Lancuam. Thank you.
Do we have any
.
.
; Dr. Laxeuam. ! would like to give just a
little opportunity for questious to Dr, Morgan,
other questions on this subject?
Dr. Hotnanp (AEC). I ‘would like to ask
whether there is any plan to incorporate in
presentations recently, and every time J found
the various organs and tissues, thal. is, to set
primarily because J have been at two of his
that there were questions to be asked, that we
Wet
Fission Products,” Report ADC-#5, April #1, L049, _
=
values, will be pushed as being the accepted
value over those caleulated from othercritical
one else to answer.
#3 ig
atgé
what do you really feel is the practical significance that vou intend to place on these maxi-
these values the variation in radiosensitivity of
up maximumpermissible doses on asort of an
reneeane2Wawiseding'toarteneerteases CSD Ny orzen hats
vores
*Therelative buzards Isted in Table TV do not take infoaccount the
crtraonadineand
oniuminmi,uhfcovamey meee
the relative hazurd from certain radionuclides.
Dr. Moraan. That has been considered.
At
present. we make @ distinetion in the case of
ORE
OFAN only, that is for the thyroid. We
permit 600 rems per week, rather than 300