Results of Calculations of External Gamma
Radiation Exposure Rates from Fallout
and the Related Radionuclide Compositions
Operation Upshot-Knothole, 1953
ABSTRACT
This report presents data on calculated gammaradiation exposure rates and
ground deposition of related radionuclides resulting from Events that deposited detectable
radioactivity outside the Nevada Test Site complex.
INTRODUCTION
The Events which deposited detectable radioactivity outside the Nevada Test Site complex! are
listed in Table. 1.
TABLE 1.
Yield, date and placement of Events of Operation Upshot-Knothole, 1953.
Event
Yield (kt)
Annie
16
March 17
300 ft Tower
Nancy
24
March 24
300 ft Tower
March 31
300 ft Tower
April 6
Air drop 6020 ft
Ruth
Dixie
Ray
Date
0.2
11
0.2
Placement
April 11
100 ft Tower
April 18
300 ft Tower
April 25
300 ft Tower
Air drop 2425 ft
Badger
23
Simon
43
Encore
27
May
Harry
32
May 19
300 ft Tower
Grable
15
May 25
Artillery shell, 524 ft
Climax
61
June 4
Air drop 1334 ft
,
8
RESULTS
Results of the calculations of relative external gamma radiation exposure rate and related
radionuclide ground deposition are given in the Appendices. These calculations are described in detail in
Ref. 2. The output of the calculation has 30 decay times, 10 from 1 to 21 h, 10 from 1 to 300 d, and 10 from 1
to 50 y. For each of these times and for zero time there are values of the external gammaradiation exposure
rate normalized to 1 mR/h, 1 m abovethe surface, 12 h after the event, the associated values of uCi/m? for
each radionuclide, and the total uCi/m?.