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OPERATION HARDTACK
Project No.
2.8a
Agency: NRDL & UCRL
Rocket Fallout Sampling
Shot Participation:
es
411016
Title:
2
Project Officer:
aad
1 over land and 1 over water)
Dr. R. R. Soule
U.S. Naval Radiological Defense Lab
San Francisco, California
ATIN: Code 3-934
Phone: Mission 8-6900
Objectives:
To measure the distribution of certain isotopes, with respect to space
and particle size, resulting from a large nuclear detonation on the surface,
for the purpose of determining nuclear testing contributions to world-wide
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Description and Experimental Procedures:
The sampling technique proposed is an extension of that currently being
& evel nea by UCRL in their "clean sweep" program of Operation PLUMBBOB. For
each event, 24 rockets will be fired in salvo from launching platforms spaced
.at various distances from ground zero.
Nearly vertical launching angles will
be used to assure impact points within the lagoon.
Symmetry of the detonation-
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} produced radioactivity about a vertical line through ground zero is assumed,
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BY AUTHORITY OF DOE/oc
WITH DELETIONS
CLASSIFICATION CANCELLED
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fallout.
and rocket trajectories will be selected to assure collection of samples at
different radii.
To avoid the requirement for hesvily protected launching
. sites near ground zero, a few rockets will necessarily be fired at small engles
from the vertical to obtain data at small radii.
An attempt will be made to
incorporate an impact separator in the rocket-borne filter heads, to collect
<the larger particles (25 microns or greater) prior to filtration.
This separa-
tor is visualized as using a system of obstructions to induce curvilinear flow,
in turn causing the larger particles to separate by centrifugal foree.
The
larger particles will thus be collected prior to impact of the remainder of
the sample with the filter paper.
In addition, specially developed sizing
techniques will be used during analysis, to provide both a back up for the
impact separator and more detailed information on particle size distribution.
Two rockets will be fired along each trajectory.
One will collect a sample
from the base to the top of the debris. The other will be programmed to
collect from an intermediate point (at or near the tropopause) to the top of
the debris.
PG
After the filter head has been separated from the rocket bcdy,
US DOE ARCHIVES
326 US ATOMIC ENERGY
COMMISSION
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