ITR-1622-1
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NEUTRON FLUX FROM LARGE-YIELD BURSTS.
Operation HARDTACK.
J. W. Kinch, et al, August 1958.
SECRET-RESTRICTED DATA
(I 05 surements were made of neutron flux and dose as a function of
distance
The Hurst fissionfoil method was used to measure flux. Detecting materials were Au, Pué39,
Npe37, y238, S and Zr. Steel buoys were used to support the detecting
materials in the Eniwetok Lagoon. Twenty-five stations were placed at
distances varying from 917 yd to 4,100 yd for both bursts.
Neutron dose
was calculated from the measured fluxes by using the single-collision
theory of dose contribution per neutron.
Neutron-flyx and dose measure-
ments were made in support of Projects 6.3 and 8.6.
oT,
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100
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The effectiveness of the Hurst fission-foil method of measuring
neutron dose is limited by the long recovery times necessary at the
per
on
Eniwetok Proving Grounds.
The buoy system of placing passive detecting
media over water is effective in areas with overpressures up to 90 psi,
and can be.made effective in higher overpressure areas by minor
modifications.
.
ITR-1622-2
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NEUTRON FLUX FROM A VERY-LOW-YIELD BURST.
Operation HARDTACK.
vw
D. L. Rigotti, et al, October 1958.
SECRET-RESTRICTED DATA
gpa Attempts were made to measure neutron flux and dose vs ground
range
ecerceeremiasanamerre The threshold detector system for making
neutron measurements utilized
Au, Pu, Np, U., and S as detector Spent s:
:
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ere
Wo results were obtained from Burst Quince,
.
DELE1
DELETED within the ranges at which the measurements were made, there was
no variation of the neutron energy spectrum above the plutonium threshold
(3.7 kev) with increasing distance from the point of detonation.
However,
the total nuxber of neutrons decreased with increasing distance from the
point cf detonation.
Personnel stationed beyond 1,000 yards from this
detonation would have received no appreciable neutron dose.
pene
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