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LB 150D-R - Alpha/Beta Fixed Filter Monitor

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  • Simultaneous Measurement of Artificial α- & β- particulates  
  • Compensation & measurement of nat. radioactivity (Rn/Th daughters)
  • 3-fold large surface proportional counter with high α- & β-Efficiency
  • Prompt measurement of the activity deposited on the collection unit
  • High sample air flow for representative sampling (up to 40m³/h)
  • Collection of airborne particulates on a 200 mm Ø glass fiber filter
  • Continuous measurement and alarm threshold monitoring during while sampling

The α-β-particulates monitor LB 150 D-R uses a fixed filter and is a true real time monitor while collection, detection and evaluation are done simultaneously.

The very high sampling rate of 40 m³/h ensures a representative sampling for both stack monitoring with isokinetic extraction as well as room or workplace air monitoring.

Technical Data
Pump: Silent Turbine Pump
- Type SV 5.130/2 max. 40 m³/h flow rate
- Type SV 5.90/2 max. 20 m³/h flow rate (optional)
Filter disk: Glas fiber filter; S-class No. 8, Schleicher & Schüll, Ø 200 mm or equivalent

Ambient temperature: 0 to + 50 °C
Sample air temperature: up to 85 °C
Relative humidity: max. 95 %
Sample air pressure: 0.7 to 1.2 bar absolute

Detector Type: 3-fold : proportional counter tube GFDZ 200 in sandwichconstruction
Lead shield: 4 pi 2 cm (5 cm optional)
Counting gas : Methane, Natural Gas, Propane P-10 or Ar-CO2 90/10
Gas consumption approx. 2 l/h
Background:
- Alpha: approx. 0.2 cps
- Alpha/Beta: approx. 2.5 cps with Antico-Stage
- Guard: approx. 6.0 cps

Measuring range: approx. 200 000 cps with Antico-stage
Effectiveness ABPD/AERD-compansation up to approx. 500 Bq/Filter, beyond this integral α- and β measurement up to 5 E+5 Bq/Filter

Efficiencies
Alpha: Am-241 - 23% (Cal. Factor kf = 4.4 Bq/cps)
Unat - 16% (Cal. Factor kf = 6.3 Bq/cps)

Beta: Sr-90 - 21% (Cal. Factor kf = 4.8 Bq/cps)
Unat - 11% (Cal. Factor kf = 9.1 Bq/cps)
Co-60 - 11% (Cal. Factor kf = 9.1 Bq/cps)

(Measured with 200 mm Ø flat surface emission sources)

Noble Gas influence
85Kr - 24.8 kBq/m³/cps
133Xe - 69.0 kBq/m³/cps

Particulates Losses
Collection Unit: Particle Ø in µm        Loss in %
                       2 neutral                    4
                       2 (3000 µ+/part.)         8,6
                       4 neutral                    6,6
                      10 neutral                   10,2

Detection Limits:                 Alpha                       Beta
Instrument background:       0.003 Bq/m³              0.012 Bq/m³
At 10 Bq/m³ nat. Activity      0.17 Bq/m³               0.35 Bq/m³

(MDC in accordance to DIN 25482 with a measuring time of 1 h and k1-α = k1-β = 1,645)

The Alpha-Beta-particulates monitor LB 150 D-R can be deployed for the measurement of airborne artificial Alpha and Beta activity in

  • Nuclear facilities in the Nuclear fuel cycle and Fission product production
  • Storage and processing of Nuclear waste products
  • Hot Cell Labs
  • Monitoring of Alpha emitting (transuranic) substances