’
.
neutron flux calculations.
Induced dose rates from soils similar to
Nevada and Chester (but not Dade) soils can be predicted by the method
of Cowan or Camu and Dolan within a factor of about three.
~*
rps
> Type 1
WT-1412
-
=
NEUTRON FLUX FROM SELECTED NUCLEAR DEVICES.
Operation PLUMBROB.
D. L. Rigotti, J. W. Kinch, H. 0. FPunsten, and B. B. Binkowski,
-
"esulteg
it the
ation,
BEST AVAILA?!. COPY
April 1960.
SECRET-RESTRICTED DATA
[|
(Supersedes ITR-1412).
Measurements were made to obtain data on
the neutrom flux and spectra for certain selected devices being tested during
at,
Plumbbob and to provide neutron flux, spectra, and dose measurements in
support of other projects. For Bursts Franklin, Wilson, Laplace, and Owens
the measured dose values exceeded the predicted values obtained by use of
the neutroz dose curves from previous data by factors of 2.4, 2.9, 3.0, and
reero,
5.6, respectively.
he
For Burst Priscilla, the measured dose was lower than
the predicted dose by a factor of 1.2.
Beyond 300 yards from ground zero
there was ro variation with increasing distance of the neutron energy
spectrum atove the thermal energies.
The extrapolation of the straight-line
n of
ing
2h)
portion of the curve of neutron flux times slant distance squared vs the
slant distance to close-in distances was invalid, since experimental data
from Plumbcob confirmed that the relationship was nonlinear at close ranges.
The foil-detector system for measuring neutron flux gave reproducible
results, further verifying its suitability for use in making measurements
in muclear weapons tests.
WT-1413
sion
ions
NEUTRON AND INITIAL-GAMMA SHIELDING (U).
Operation PLUMBBOB.
R. C. Tompkins, C. F.
Weaver and G. A. Peterson, January 1961.
SECRET-RESTRICTED DATA
nity
hese
- fine
ester
ese
=
(Supersedes ITR-1413).
The objectives were to:
(1) perform
eutron~ acl gamma-shielding tests on structures, shelters, fortifications,
Ontos vehicles, and M-48 tanks; (2) determine relative neutron and gamma
inside/outside dose ratios for two types of tank armor; (3) perform neutron-
and gamma-ettenuation studies in soil in order to obtain an indication of
the variation of gamma dose, neutron dose, and neutron spectrum with depth.
over
sed
nd
wade
The shielding characteristics of M-48 tanks, Ontos vehicles, hemispheres
of standar= and plastic laminated tank armor were studied during Bursts
Franklin, lassen, Wilson, and Hood.
.
-
Owens.
Field fortifications and underground shelters were instrumented
for Burst Friscilla.
Results indicate that plastic-laminated armor reduced
RESTR
ATOM
The attenuation of neutrons and gamma
rays by prepared Nevada Test Site (NTS) soil was investigated during Burst
Lad
isis
‘ated
1ethod
il-
-
\