TRITIUM MONITOR

For Public Release Level

Model # STG-4S/D & STG-5ATL([fig] ([fig] STG-4S/D) FEATURES:

* MICRO PROCESSOR TO ESTABLISH UNITS
  AND PARAMETERS

* COMPUTER OUTPUT

* DIGITAL ACCURACY

* SENSITIVE TO 10^{-7} \mu Ci/cc

* MEASURES DOES-RATE AND DOSE

* INCLUDES ALARM

* INCLUDES HARD COPY PRINTER

* DYNAMIC BACKGROUND COMPENSATION

* CAN ACTUATE COMPUTER OR REMOTE CONTROL

* MEASURES TRITIUM AS HTO IN PRESENCE OF
  OTHER RADIOACTIVE GASES (STG-5ATL)

* CLEANS GAS STREAM OF PARTICULATES AND IONS

GENERAL DESCRIPTION: Technical Associates' STG-4S/D and STG-5ATL
tritium monitors are sensitive, rugged stack or effluent
monitors for detection and measurement of airborne tritium.


The subtractive balanced chamber electrometer circuit decreases
background effects to negligible levels, and the deionized
and filtered intake reduces to negligible levels spuriosity
based on smokes, dusts, and existing ionization in the air.
Inlet and outlet hoses allow the return of monitored air
to source: interiors of fume hoods, exhaust stacks, etc.
The STG-5ATL will measure airborne tritium as HTO in concentrations
as low as 1 x 10^{-7} \mu Ci/cc
of air in the presence of other isotopes.


All instruments are calibrated at the factory. Calibration
check may be performed in the field with a license exempt
microCurie level beta source.

T_{\textrm{A}}                                   TECHNICAL ASSOCIATES                                   
------------------------------------------------------------------------------------------
  7051 ETON AVENUE * CANOGA PARK, CA 91303 TELEPHONE (818) 883-7043 * FAX(818) 883-6103   


$Revision: 1.1 $

TRITIUM MONITOR

For Public Release Level

Model # STG-4S/D & STG-5ATL

SPECIFICATIONS:

Ranges: (No range switching)

STG-4S/D: Six decade 10^{-7}- 10 ^{-1}
\mu Ci/cc - Digital-Auto ranging.

STG-5ATL Four decade 10^{-7}- 10 ^{-3}
\mu Ci/cc - Analog-Log Scale

Background: Essentially eliminated by subtractive balanced
chambers.

Smoke, Dust & Ion Elimination:
Filter and deionizer reduce effects to negligible levels.

Circuit: Electrometer circuit amplifies net difference between
a 50 liter tritium internal chamber and a background chamber
of similar size and configuration.

Detector

STG-4S/D: Air stream is passed through sample chamber to
measure all radioactive gas content; normally as tritium,
optionally as other (e.g. Xenon, Krypton, C^{14}
O_{2} etc.)

STG-5ATL: After first chamber, HTO is removed from air stream,
which is then passed through second chamber. Reading of
difference gives concentration of tritium as HTO in presence
of other isotopes or other compounds.

Calibration: Can be calibrated internally with tritium (or
HTO) gas, or on a gamma calibration course; or can be checked
at a single point with an external (not provided) beta source.

Output: STG-4S/D - RS-232 serial output.
STG-5ATL - Digital output. One count per 1 x 10^{-7}
\mu Ci/cc.
Optional 0-5 volt or 4-20 mA

Alarm: High Level: Red flashing light plus warbling sound
System Fault Alarm: White steady light

Remote Alarm: TTL closure-failure. TTL closure-high
level.

Hard Copy

STG-4S/D: 32 column digital printer with RS-232 includes
date & time.

STG-5ATL: Included MRR-5 strip chart recorder gives permanent
record. Covers same ranges as readout meter. 2"
chart width, advance rate 2"
/hour. Runs 30 days without reloading.

Dimensions: 23" wide x 66"
high x 36" deep.

Shipping Weight: 635 lbs.

Optional Accessories: Remote alarm (audible & visual)
Model Ral-8 (including 25" of cable).
Can be used to 500 feet. 4-20 mA for computer.

Optional Features: Analog - 1 volt/decade
Interconnection to/from port of other gas or particulate
monitor.
Readout as radioactive gas other than tritium.

T_{\textrm{A}}                                   TECHNICAL ASSOCIATES                                   
------------------------------------------------------------------------------------------
  7051 ETON AVENUE * CANOGA PARK, CA 91303 TELEPHONE (818) 883-7043 * FAX(818) 883-6103   


$Revision: 1.1 $