Models SRJ-7 and HRJ-7 Juno Survey Meters

MANUAL OF OPERATION
Technical Associates
JUNO RADIATION SURVEY METE3
Models SRJ-6 and HRJ-6
1. GENERAL DESCRIPTION
The Juno Survey Meter is a portable, battery operated instrument for
measuring the intensity of, and distinguishing between alpha, beta and gamma
radiation. This instrument is normally supplied in two models: SRJ-6
(standard range) which has a sensitivity range suitable for all routine applications;
and HRJ-6 (high range) for use where exceptionally high radia-
tion levels are likely to be encountered.
cations.
Both models meet A.E.C.
specifi-
The instrument comprises an ionization chamber, an electrometer circuit,
an indicating meter calibrated directly in MRhR, a removable plug-in battery
pack, and two absorption filters for the rejection of either alpha or beta
particles.
The Juno is self-contained in a hard-chrome plated aluminum
case which can be easily decontaminated when necessary.
To easily identify the High Range Juno (HRJ-6), the range selector
switch knob and the meter face are red in color.
11. SPECIFICATIONS
Ionization Chamber:
Volume: 27 cubic inches
Window Opening: 3" X 4 5/8"
/ -
Alpha Screen: 0.4 mil (0.68 mg/cm2) rubber hydrochloride,
or 0.25 mil (0.89 .. %/em2) mylar film
Batteries :
I
-. - Alpha Rejection Absorber: 0.01'' cellulose
acetate sheet
c---,*
Beta Rejection: 0.102'' aluminum
4 each 22% Volt "B" Batteries
2 each 1.35 Volt "A" Batteries
2 each 6.5 Volt "B" Batteries
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