FHT 3511 Positron Stack Monitors

FHT 3511 Positron Stack Monitors


Thermo Scientific™ FHT 3511 Positron Stack Monitor is a stack monitoring detector designed specifically for positron emitters (PET effluents) for indoor and outdoor use. A unique stack monitor using coincidence counting and large area plastic scintillation detector to ensure excellent geometrical efficiency and reduced sensitivity to ambient gamma radiation.

Measures 511 keV annihilation photons to determine the concentration of positrons in the duct or stack. With each radioactive decay, F-18 or other, PET-nuclides emit a positron which annihilates via the simultaneous emission of two 511keV gamma quanta under 180°.

  • Extremely low coincidence background
  • Signal-to-background ratio enhanced between 1 and 2 orders of magnitude (as compared to standard counting systems)
  • Detection limits well below 1 kBq/m3
  • Total rejection of gammas from outside the active detection volume
  • No lead shielding necessary
  • Easy calibration using a point source (i.e. Ge-68) on the outer surface of the duct
  • Large scintillation detectors are mounted outside the stack
  • Versatile Windows based software for operation and report generation
  • Graphic display of last 24 hours/6 days
  • Immediate alarm generation
  • Optional DDE exchange with monitoring program
  • Optional data export to spread sheet program
  • Optional advanced long term data storage and display program “NetView”
  • Sturdy aluminum frame
  • Stainless steel fittings
  • Corrosion free
  • Suitable for indoor and outdoor applications
  • White, UV-stabilized PVC cover panels with increased impact strength
  • Variable height with easily adjustable feet