The Model 1925-PR is an automated, real-time low-level tritium in water monitor that utilizes a novel electrolysis method to separate the hydrogen (tritium) from oxygen and measure it using an ultra-sensitive gas proportional detector. The main advantage of the 1925-PR is that it does not require liquid scintillation counting cocktail nor does it produce hazardous mixed waste that must be carefully stored, transported, and disposed of.
The 1925-PR consists of two heavy-duty floor standing cabinets connected to each other. The first cabinet is the sample conditioning cabinet and consists of the sample filtration and separation components. The second cabinet is for measuring the sample and includes the gas proportional detection system.
An electrolytic hydrogen gas separator is used to separate the input water into hydrogen gas (tritium) and oxygen. The oxygen is diluted and safely released while the hydrogen (tritium) is mixed with P-10 gas and pumped through an ultra-sensitive proportional counting detector. By utilizing proportional counting technology, the user only has to acquire a compact standard steel tank of proportional gas (8.5 m3 or 300 ft3), which will last for up to two months of continuous operation and is available from a variety of suppliers. The P-10 counting gas is 90% Argon and 10% Methane, and is not toxic or combustible. The hydrogen is dealt with safely by having the instrument enclosures under negative pressure and diluting the small concentrations of hydrogen gas with P-10 gas.
Measurement via this method achieves same or better low-end sensitivity, without having to deal with LSC fluid and waste. A second, sealed proportional counter eliminates the effects from external gamma fields and 1” lead shielding around the counter tubes further reduces background gamma and improves the statistical signal to noise ratio to enhance sensitivity.
Includes a water pretreatment and filtration system. The 1925-PR can be configured to measure either freshwater or seawater.
|MEASUREMENT RANGE||4.5 Decades; Optional 6 Decades|
|MINIMUM DETECTABLE LIMIT||3.7 kBq/L (0.10 μCi/L) in 40 minutes or less|
|DISPLAY||LCD Color Touch Screen; units of display user-settable (i.e., kBq/L, μCi/L)|
|RESPONSE RATE||40 minutes to reach 90% of final value|
|MEASUREMENT METHOD||Gas flow proportional counters|
|PROPORTIONAL COUNTERS||Dual copper clad acrylic counter tubes, 2 liter active volume, |
2.5 liter wetted volume, 0.001 inch tungsten collector anode
|COUNTER GAS||P-10 or “MAGIC” gas for high performance|
Flow rate 250 cc/min, typical
|MEASUREMENT ALARM SET POINT||Can be manually adjusted|
|DATA RECORDING/OUTPUT||Insertable USB flash drive; Data communication via TCP/IP. |
Standard data output is USB & RJ-45
|SAMPLING/MIXING SYSTEM||See diagram 1 on page 4.|
|WASTE MANAGEMENT||Unused water output lines with Swagelok® fittings are provided, |
user to provide recycling system or waste collection system.
|TEMPERATURE||0°C to 50°C|
|HUMIDITY||0 to 95 % R. H.|
|SEISMIC||Withstands modest shock|
|ELECTRICAL||Power 110/230VAC, 5A|
|MECHANICAL||Self contained, mounted on a steel frame with lifting eyes for easy transport.|
|DIMENSIONS||23.6in x 23.6in x 84.0in
(600mm x 600mm x 2133mm)
|WEIGHT||1100 lb (500 kg)|
|FILTRATION AND SEPARATION CABINET|
|DIMENSIONS||31.5in x 23.6in x 84.0in
(800mm x 600mm x 2133mm)