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LB 110 – room or exhaust tritium measurement system

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Huolto & Korjaukset Tarjouspyyntö
  • Monitoring of tritium H-3 activity concentration in room and exhaust air
  • Low interference of increased background levels or other gaseous nuclides than H-3
  • Two measuring channels
  • Compensation of other gaseous nuclides than H-3 or background (optional)
  • Optimization for max H-3 sensitivity or low spillover
  • Detector with thermostat controlled heating (optional)
  • Two different gas mixtures available: Methane (CH4), Argon-Methane (P10)

The air to be measured is mixed with a suitable counting gas and passed through a 1.3 liter volume proportional counter tube. Methane (mixing ratio air/gas 1:3) or Argon-Methane (P10, mixing ratio air/gas 1:4) are used as counting gas. The accuracy of the measurement is dependent on the constancy of the mixing ratio of air and counting gas. Due to that the LB 110 ensures a good and reliable gas-air control. Measuring air and counting gas flow are measured separately and kept at a constant level. 

There are two evaluation units for the LB 110 Tritium-Monitor: The data loggers LB 5340 (shown on the picture) or LB 9000

Tietolomake

Ota yhteyttä

Göran Jonsson

Göran

Tekniset tiedot

Mechanical Data    
Dimensions counter tube LB 6225:    430 mm x Ø 80 mm (active volume 1.3 l) 
Dimensions / weight device LB 110: 500 mm x 420 mm x 335 mm (L x W x H) / 20 kg 
Calibration and Setting Data    
Counting gas   Methane P10
  (CH4)            (90% Ar, 10% CH4)
Air-counting gas-mixture           1 : 3         0,044444444
Flow rate l/min     0.25 : 0.75 l    0.20 : 0.80 l
Measuring air contents in the counter tube 0.325 l 0.260 l                      
Efficiency for 3H approx. 60%   approx. 55%
Calibration factor for 3H 5.1   7.0
(kBq/m³ per cps)     
Background in 3H channel 0.4 to 3 cps 0.4 to 3 cps
Measuring range                                     500 Bq/m³ – 20 MBq/m³ 500 Bq/m³ – 20 MBq/m³
     
Spillover factor      
137Cs in 3H channel 5 to 7 %      5 to 7 %
85Kr in 3H channel 3 to 5 % 3 to 5 %
14C in 3H channel 23 to 25 % 23 to 25 %
     
Detection Limits for 3H in kBq/m³ at a background of 2 cps    
Measuring time                                  Methane P10
  (CH4)                  (90% Ar, 10% CH4)   
30 s 4.0 5.4                           
60 s 2.8 3.8
600 s 0.9 1.2
1 h 0.4 0.5
24 h 0.07 0.1
     
Gas and air connections (connection nozzle)    
Gas Ø 7 mm  
Measuring air Ø 7 mm  
Outlet for gas-air mixture Ø 7 mm  
     
Power supply    
Voltage   230 VAC 50 Hz  
Power consumption                             Max. 40 W  
Fuses 230 VAC: 0.5 A, T   
     
Heating supply (optional)    
Voltage   230 VAC 50 Hz   
Power consumption           Max. 82 W       
Fuses    230 VAC: 2 A, T   
Heating controller (front panel fuse)      230 V / 0.315 A, T  
     
Operating temperature range        0 °C to 50 °C  
Relative humidity                  0 to 90 %  
Protection type IP32 in desktop housing  

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