Page 208 - Open-Hole Log Analysis and Formation Evaluation

‘PROBABILITY OF EMISSION PER DISINTEGRATION the FIGURE 194 I.
, re (11%) 4.460 OPEN-HOLE
FIGURE
Tittman
i"
10.3
40
10.2

University
La
MeY
|
Decay
Gamma
GAMMA~RAY
15
THORIUM
1956 by permission
Whol...
) I t t f i i of Kansas. 1956 by permission of Scheme of 70K. From Tittman | 9 Gamma Decay «40 Beta MEASUREMENTS LOGGING
T 2
seals
Ray Emission
ENERGY’
of the
URANIUM-RADIUM
SERIES
t
2.5
POTASSIUM
saree
(MeV)
Spectra
T 3
University
SERIES

of Kansas.
Decay
- 20
Ca
of Radioactive Minerals,

(89%)

From

ft
for
the
One
This
with
FIGURE
FIGURE
When
(kk
shale,”
long
Cathode
|
of
varying
Radiation
defines
Field
Ray —>
reasons,
counters
13
10.4
~

standard
10.5
company
24-ft
=
as
(installed
calibrated
+
gamma
of
radioactive
the
the
sandwiched
in
at
API
placed
may
Tube
ppm
CALIBRATION
Glass
radioactive
by
ray
pill
: Ut ; : C rP oto! hotons : Crystal { Scintillating pws : : 195 10. THE GAMMA RAY LOG
this was
contains
the
a
OF
8-ft
sandwich

place
53-in.
different
The
Scintillation
calibration is
is
calibration
difference
|~-——4
problems
illustrated in
its
cement
logs,.so

in
pill
characteristics.
found to
of
uranium,
from
sizes
central
Feet
is
sections
micrograms of
an
be
figure
University
24
On
Counter.
a
the
8-ft
tool in
and
system,
an
mixture
API
of
cased with
performed
as
gamma
10.5.
this
+
very
ppm
Gamma Ray Standard.
——_>|
radium
of neat
e
center
@)
since
shapes
pit
ray
section
Courtesy
with
old
per
a
of
to
all
200 API
standard
Neat
5%4-in. J55
Houston)
ton
Photons
the
Electrons
0.1-millicurie
High Vacuum
portland
A cylinder
Cement
Cement
unsatisfactory
2” J55
Thorium
logs,
thorium,
of
make
4
logging
encased
was
radioactivity between
Potassium
24
13
a
consisting
in
is
logging
Portland
the
Portland
4%
casing.
the
ft in
and
GAMMA RAY DETECTORS AND
source
Casing
ppm
ppm
units. . Any
of
gamma
portable jig
cement
contains
method
the
steel
of
4%
neat
on
scale
devised.
ray
‘an
that
formation:
Gearhart Industries,
LOGS
The API
A
calibration.
diameter
cement
logging
Inc.
For
choice
either
radium
companies
cement
might
test
housings
and
detector,
contains

many
be
of calibration
of'a
use
mixed
“artificial
24
pit
of
potassium
side.
a
and
standard
service
226.
it,