3.
Adequate diagnostic information for weapon development can almost
certainly be obtained at no great increase (and perhaps some decrease)
in cost by testing underground, It has not been proven that radiochemical detectors can be used, but it appears possible that some
can by appropriate design of underground chambers,
Some extra
cost may be incurred if it is required to duplicate diagnostic bunkers,
etc., in order to avoid testing several devices in one regicimso as
to reduce suspicion; this is characteristic of clandestine rather
than of underyround shots,
Experimental data is lacking or insufficient and should be acquired
either prior to or as part of an agreement on the following subjects:
(a) Reducing the seismic energy by choice of medium and des ign
of explosion chamber, Reducing the radius of the radioactive
region by choice of medium,
et
Possible distinctive characteristics of underground explosions
be ee
{c)
The complete range of radiochemical detectors in diagnostics
of underground shots.
which will enable them to be told surely from natural earthquakes, This includes the seismograph records at a distance,
and earth motions nearby. Possible special chamber design
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(b)
to remove such distinctions if any are found to exist must also
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This has not yet
proven feasible even from inside the tunnel,
.
Use of acoustic sounding from above the surface to detect
the disturbed region below the surface.
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(c)
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be studied,