Beta Radiation Effects From Fallout Due to the Cabriolet Nuclear Test

7/18/2019 Beta Radiation Effects From Fallout Due to the Cabriolet Nuclear Test

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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



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



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

<

~ 1 t

50Co

••••••

; n ~

; ~ ; ; ~

:

I

t

N

:r

I

~ ~ ~

~ 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



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



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.



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

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Beta Radiation Effects From Fallout Due to the Cabriolet Nuclear Test