Models SRJ-7 and HRJ-7 Juno Survey Meters

4M- 10/58
Bullefin No. 744
INSTRUMENTATION FOR NUCLEAR RESEARCH
IONIZATION CHAMBERS (MODELS IC-1 and IC-2)
CONNECTOR
I
APPLICATION: These ionization chambers are used for detection and
measurement of Beta and Gamma radiation or Gamma radiation only. They
can be installed in “hot” locations in a laboratory or reactor installation
where it is desirable to monitor for control, health, or safety purposes.
Model IC-1 has approximately one-half of the wall area cut away in the
form of four windows which are fitted with .005” thick cellulose acetate.
It is sensitive to soft radiation and is used for the detection and measurement
of Beta and Gamma radiation. Model IC-2 is of solid wall construction
and is used for the detection and measurement of Gamma radiation.
CONSTRUCTION: These chambers consist of a bakelite tube 5” in diameter
x 18%’’ long, with bakelite end plates. One end plate holds the high voltage
input and signal output connectois. At the other end of the chamber, a
space is provided to hold a dessicant to assui’e reliable operation under
conditions of high humidity. Silica jell is used as the dessicant and is
supplied in a cloth bag suitable for inseltion in the cavity provided.
The collectoi, is an aluminum tube Yi’’ in diameter x 17%” long, and
is supported by Teflon insulation .at the back end, and by polystyrene
insulation at the connector end. Guard rings are pi’ovided at either end to
fuither reduce leakage. Leakage resistance is 10:’ ohms or higher to eithei.
ground or high voltage.
The inside of the 5” cylinder and the inside of the end plates are coated
with aquadag to form a conducting surface. The aquadag coating is connected
to the high voltage input connector. The electrical continuity resistance
of the aquadag coating is held to less than 5000 ohms.
Cai.eful craftsmanship thi.oughout assembly and testing insures
that i.igid insulation specifications are maintained
INQUIRIES INVITED
In addition to the types
SPEClFlCATlONS :
OPERATING VOLTAGE RANGE: 275 to 325 volts D.C.
described. Technical Associates
- SENSITIVITY: Less than 1 mr/hr with micro-micro ammeter
is prepared to supply ionization
on 0.1 volt 10-11 ampere range.
chambers for special purposes to
* ENERGY DEPENDENCE: Small corrective factor below 0.3 mev;
customer specifications.
flat above 0.3 mev.
* OIMENSIDNS: 5” dia. x 20” long. WEIGHT: Net 3 Ibs. Shipping 6 Ibs.
TA
TECHNICAL ASSOCIATES
140 WEST PROVIDENCIA AVENUE BURBANK, CALIFORNIA