the Molten Salt Energy Technologies Web Site

J. L. Meem
R. G. Cochran
M. P. Haydon
K. M. Henry
H. E. Hungerford
Physics
Gamma-ray spectral measurements on
the divided-shield mockup have been
extended, and the neutron and gamma
dose measurements on the shield mockup
are reported. The air-scattering
experiments with the reactor at 100 kw
are now under way, and the program of
irradiating monkeys with the reactor
has been started.
MEASUREMENTS WITH THE DIVIDED-SHIELD
MOCKUP
Two further sets of measurements of
gamma-ray energy spectra and angular
distributions from the di vi ded - sh ie 1 d
mockup (with lead disks) were made
after a preliminary attempt by the NCA
group to calculate the dose to be
expected at the crew position. The
measurements were made at $J = 60 deg,
8 = variable,(’) and $J = 60 deg, qb =
variable. The energy spectra obtained
are shown in Figs. 7.1 and 7.2, and
the angular distribution for the angle
8 is shown in Fig. 7.3. For all
measurements, the spectrometer col-
limator remained horizontal.
Table 7.1 shows all gamma-ray
spectral measurements completed since
the last tahular summary.(2) It is ex-
pected that the information is now
sufficiently complete to enable an
accurate calculation of gamma dose at
the crew position.
Since the collimator is always kept
horizontal in the measurements, $, 4,
and 6 a re sufficient to specify the
(*)For a definition of angles 4, 6, and 0 see
Table 7.1. For a discussion of the experimental
setup. see F. C. Maienachein, Gamma-Ray Spectral
Measurements with the Divided-Shield Mockup,
Part I, ORNL-CF-52-3-1, Part 11, ORNL-CF-52-7-1,
Part III, ORNL-CF-52-8-38.
(2)ANP Quar. Prog. Rep. June 10,
1294, p. 45.
7. BULK SHIELDING FACILITY
1952, ORNL-
PERIOD ENDING DECEMBER 10, 1952
E. B. Johnson
J. K. Leslie
T. A. Love
F. C. Maienschein
G. M. McCammon
Division
position and orientation of the spec
trometer. The angle e for the measure-
ments with $ = 60 deg and $J = 0 was
determined so that the spectrometer
collimator would always look at the
edge of the lead disks in the divided-
shield mockup.
Center-line measurements of gamma-
ray and fast-neutron dosages and also
thermal-neutron flux have been com-
pleted and are shown in Figs. 7.4, 7.5,
and 7.6. The attenuation curves are
shown with and without the shield in
place. It should he remembered that
for these measurements the reactor had
a beryllium oxide reflector.(3) The
dashed curves on Figs. 7.4, 7.5, and
7.6 represent the center-line datac4)
with the water- reflected reactor.
AIR- SCATTER1 NG EXPER IFIENTS
The air-scattering experiments with
the reactor at a power of 100 kw are
well under way, Indications are that
the previous measurements, reported
last quarter, were somewhat pessimistic,
but confirmation of the AN?-53 shiela
designc5) is not yet clear. It is to
be expected that these experiments
w i l l soon he concluded, since the BSF
is poorly adapted to air-scattering
measurements.
IRRADIATION OF ANIMALS( 6,
The program of irradiating monkeys
by using the reactor, as outlined in
(3)ANP Qu.ar. Prog. Rep. March 10, 1952,
OWL-1227, p. 76.
(4)ANP Quar. Prog. Rep. June 10, 1951, ANP-65,
D. 110.
(5’Report of the Shielding Board for the Aircraft
Nuclear Propulsion Program, ANP-53 (Oct. 16,
1950). . ..
(6)This is a joint program in which the USAF
School of Aviation Medicine, Consolidated Vultee
Aircraft Corporation, and Wright Air Development
Center, as well as ORNL, are participating. .
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