peND
WT-1676
-
THEPMAL RADIATION FROM VERY-LOW-YIELD BURSTS.
Operation HARDTACK.
J. J. Mahoney, J. C. Maloney, S. D. Furrow, D. T. Kilminster,
N. J. Alvares, T. S. Dahlstrom, and J. C. Ulberg, June 1960.
CONF IDENTIAL-FORMERLY RESTRICTED DATA
e
to:
(Supersedes ITR-1676).
Measurements were made
to determine the thermal radiant exposure (cal/cm
vs distance
from ground zero for a fractional-kiloton device and the total luminous flux
(lumens/ft*) as a function of both time and distance from ground zero,
DELETED
The
luminous flux was sufficiently high to saturate the illumination sensor
system, therefcre no peak luminous flux information was recorded.
The
measured values for thermal radiation agree with the established scaling
laws for a surface detonation.
Measurements were made during Burst Hamilton
to determine the thermal radiant exposure vs distance for a fractionalkiloton detonation, and to compare the experimentally obtained radiant-exposure
values with thcse calculated from existing scaling laws.
Radiant exposures
Burst Hamilton were measured at horizontal distances of 175 to 700 ft from
ground zero using thermistor calorimeters.
The results were, in general,
inconclusive because of the very-low yield of the device and also perhaps.
because shielding material in the bomb tower partially obscured the thermal
line of sight.
WIr-1677
-
GAMA DOSE FROM VERY-LOW-YIELD BURSTS (U).
Operation HARDTACK.
J. C. Maloney and M. Morgenthau, August 1960.
CONFIDENT IAL-FORMERLY RESTRICTED DATA
(gumemt (Supe=sedes in part ITR's - 1677,
The objectives
the initial gacma dose vs ground range and
1679
(2)
and 1680).
were:
(1) to document
to measure the total gamma
dose received at a point as a function of time, at distances of military
interest, for @ fractional-kiloton nuclear surface burst.
The objectives
during Bursts Jamilton and Humboldt were: to provide gamma-dose-measurements in suppert of the biomedical Project 4.2 and (2) to document the
initial gamma Sose vs ground range.
In addition, secondary objectives of
this project were to document residual radiation intensities and to determine
the field garmvs-decay rate.
Results of the measurements are discussed and
data are tabuated.
F
Handle
ata in Foreign Diss
on 144b, Atomic Energy Act of 1954
CO