Eberline RO-2 - General Information; Purpose and Description of the Model RO-2; Technical Specifications

сла
MODEL КО-2
SECTION 1
GENERAL
А. PURPOSE AND DESCRIPTION
The
Model
RO-2
is
a
portable
air
ion
chamber
instru-
ment
used
to
detect
beta
(8),
gamma
(у),
and
x-ray
radiation.
The
RO-2
has
four
linear
ranges
of
operation
to
measure
dose
rate
for
x-ray
and
у
radiation.
The
ion
chamber
is
vented
to
atmospheric
pressure
and
is
speci-
fically
designed
to
have
flat
energy
response
into
the
x-ray
region,
The
Model
КО-2
is
sensitive
10
8,
y,
and
x-ray
and
is
calibrated
to
y radiation
(77С5),
A
single
rotary
switch
turns
the
instrument
off,
provides
a
bat-
tery
check,
checks
the
zero
setting,
and
selects
the
range
of
operation.
B. SPECIFICATIONS
1. Detector
a. Size: 3 inch diameter, 12.7 in? volume (7.62 cm,
208 cm’).
b. Fill: Air, vented to atmospheric pressure.
c. Wall: One-sixteenth inch phenolic, approxi-
» mately 200 mg/cm? inside 0.050 inch wall aluminum
case.
d. Window: Two layers 0.001 inch mylar, approx-
imately 7 mg/cm' total.
€. Beta Shield: Sliding shield on bottom of case
with positive friction lock. Approximately 400 mg/cm?
(1/8 inch phenolic).
f. Radiation Detected: Beta, gamma, and x-ray.
g. Photon Energy Response: Nominal x 15 percent
from 12 keV to more than 1.3 MeV. (See Figure 1-2.)
h. Example of Beta Response
(1) Uranium Slab: 33 percent of true mrad/h
field behind 7 mg/cm? window with RO-2 resting on
slab, slide open.
(2) "Sr-"Y: 75 percent of true mrad/h field at
40 cm with slide open, 8 percent with slide closed.
1. Fast Neutron Response: Reads approximately 10
percent in mR/h of true neutron field in mrem/h.
2. General
a. Ranges: Four linear ranges: 0-5, 0-50, 0-500 and
0-5000 mR/h.
b. Meter: Ruggedized, sealed, 2.38 inch (6.04 cm)
scale length, 2 percent accuracy. Linear markings from
0 to 5 in 25 minor increments.
c. Response Time: 5 seconds, 0 to 90 percent of
reading.
d. Linearity: Within +5 percent of full scale.
е: Battery Dependence: No calibration shift with
battery voltage change. (Down to battery /ВА ТТ] check
mark on meter.)
SLIDE CLOSED
RELATIVE RESPONSE
ENERGY (Кем)
Figure 1-2. Nominal Photon Energy Response
CHANGE 5