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PROJECT CABRIOLET
PROJECT CEP-67.3
PNE-956
NUCLEAR EXPLOSIONS - PEACEFULL
APPLICATIONS (TID-4500)
LEGAL NOTICE
This report was prepared as an account
of
Government
sponsored
work.
Neither
the United
State:, nor
the Commission,
nor any
person acting
on
behalf
of the
Comrntssion:
· Makes any warranty or representation, expressed or Implied, with respect to the ac _
~ : c y ,
completeness,
or usefulness of the Information contained
In
this report, or that the ~ ~ e
l
any 1
1
nformaUon, apparatus, method, or
process
disclosed In this
report may
not Infringe
pr vate
y
owned
rights;
or
B. Assumes any liabilities
with
respect
to
the
use
of, or for
damages
resulting from th
use of any Information, apparatus,
method, or process
disclosed
in this
report
e
1
As
used In the above, "person acting on behalf of the C o m m t S ~ t o n tnc.ludes any em-
p o ~ e e or
contractor of
the Commission,
or
employee of such contractor, to the extent that
sue employee
or
contractor of the Commission,
or
employee or such contra
: e : i ~ t e s , Provides
access
to, any information ·pursuant to his e m p l o y m ~ ~ r o : : : : ; : ~ ;
e omm seton, or hts employment with such contractor,
ECOLOGICAL AND ENVIRONMENTAL EFFECTS FROM
LOCAL
FALLOUT
FROM CABRIOLET
I.
RADIATION
OSES
AND SHORT-TERM EFFECTS
ON THE VEGETATION FROM CLOSE-IN FALLOUT
by
William
A.
Rhoads, Robert
B.
Plott,
Robert
A.
Harvey,*
and
Evon M Romney**
Project Officers
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1.
INTRODUCTION
Project
CABRIOLET
was
a nuclear experiment in hard, dry rhyolite
rock executed as
part of
the PLOWSHARE
Program for
developing the use of
nuclear energy in excavation. CABRIOLET
was
detonated on January 26,
1968, at 0800:00.105 (PST), in
Area
20 at Nevada Test Site
NTS).
The
resultant
yield
was
2.3
±
0.5
kt.
The
emplacement hole
was
U20Q,
at
geodetic coordinates:
Longitude: 116° 30 52.0082
11
Latitude: N 37° 16 51.0715
11
Surface ground zero GZ was 1888.8 meters 6197 feet MSL; emplacement
depth (to the working point)
was
52.04 meters (170.75
feet .
The
result-
ant
crater was
characterized by the following dimensions and volumes:
1. Radius of apparent crater
2.
Maximum depth of apparent
crater
3.
Average
height of apparent crater
lip
crest
4. Radius
of
apparent
lip crest
54.68 meters
35.48 meters
9.69 meters
65. 14 meters
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I
N
I
12 1-
1 1-
8
4
1
l
2 1 J
6220
6200
6
628
6260 -
0
111•1
I
I
I
12.51111
ill
~ ~ ·
• • •·••
I .
APPROXIMATE ELEVATION (
FEET,
MSL j
100
2
25
em OFF
GROUND
00
·····I
h
1
''1
, I
.
1:
p .
• :1
Ii
3TAH)N
NUMBER
30C 400
HORIZCNTAL DISTANCE, METERS
I
;
; ;
l:::
·::;
= ~ ~ ~
i
~ g :
t:
:
:
~ ~ ~ ;
i
f ~ f
I
II
: 1
f
j
II
I
I
,111•
II
.. •
: t
t
<
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50Co
••••••
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:
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t
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:r
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~ ~ ~
~ f ;
'
:.
l
.
I
:-:
t
: : ~ ~ i
t;
'
r
f'IETERS (
MSL)
26
28
3
6
Fig 10 Beta to gamma
dJse
ratio; for various parts of
f llout
pattern
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BETA
DOSE
(RADS) AT
STATIONS
ON
610 METER
ARC
2000 FEET)
LEGEND
DEGREE
AFFECTED
I I I.
NORMAL ARTEMISIA
9
II
13
15
BOO BOO
500
10
12
7
300
19
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I
w
00
I
GROUND ZERO
WI
ND
DIRECTION
55 6
ARTEMISIA SHRUB 25 em DIAMETER
ROCK
1 1 15
m
5 em HIGH
READINGS ARE SHOWN
IN
mR I hr AS BETA PLUS
GAMMA OVER GAMMA ONLY
THICK CLUMP 3UNCH GRASS
Oryzopsis}
25 em HIGH
MORMCN TEA Ephedra) 25 em HIGH
ON OPEN SMOOTH GROUND
Fig. 13. ome microtopographic variations in backgroJnd readings near Stations 6 and 7 uly 3 1968.
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I
c :
I C
I
\
14
85
12
10
8
r:
a
6
_______
J
~
4
2
/
I
0 2
4 6
\
\
\ GAMMA PLUS BETA
OF
SURFACE LEAF LITTER
~
UNDER WINDWARD SIDE
OF
ARTEMISIA SHRUBS
\
\
\
\
\
\
T
\
\
\
\\
\
\
\
\
\
L
_J
8 10
STATIONS
12
READINGS
OVER OPEN
GROUND
GROUND
LEVEL
GAMMA PLUS BETA
GAMMA
f t
ABOVE
OPEN GROUND
GAMMA PLUS BETA
14
6
8 20
Fig.
14
Dose rates
showing
the very high rates associated with
leaf
l i t ter July 3 1968