e, Adequate time to prepare - there must be sufficient
time before the demonstration shot to develop the method,
secure agreement with the U. N. agency, work out the
necessary details, and train the observer team.
f. Operational simplicity - the scientific effort
and logistic support required from the test organization
should not interfere with the HARDTACK program,
6, The possible methods can be grouped under two general
headings -- absolute and comparative,
The absolute methods Involvc.
the direct measurement on a single shot of the quantities
necessary to demonstrate the fact of reduced fallout,
The
comparative methods require the comparision of these quantities
-on two shots, without the necessity for disclosing the absolute
values of these quantities.
{. The first method is to show on a single clean shot that
the fission yield is only a very small fraction of the total
yield,
The total yield can be obtained by any of the usual
hydrodynamic methods -- firedall photography, time of shock
arrival, or shock intensity.
The fission yield can be obtained
either by the usual radiochemical techniques or by measurement
of the amma radiation from the ball of fire during the first ten
seconds after detonation.
8, The radiochemical method for fission yield requires that
a tracer be installed on the device for bomb fraction, the cloud
be sampled and the fission yield be determined by a limited amount
-of radiochemical analysis.
U. S.
scientists would monitor this
part of the work of the team to prevent more detailed chemical
measurements than necessary for determining the fission yield,
or removal of samples for more detailed analysis at a later time
(Appendix "D").
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