With each radioactive decay, F-18 or other, PET-nuclides emit a positron which annihilates via the simultaneous emission of two 511 keV gamma quanta under 180 °. 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.
Product Detail
Features
Total rejection of gammas from outside the active detection volume
No lead shielding necessary
Signal-to-background ratio enhanced between 1 and 2 orders of magnitude (as compared to standard counting systems)
Easy calibration using a point source (e. g. Ge-68)
Large scintillation detectors are mounted outside the stack
Versatile Windows based software for operation and report generation
Introduction
For PET nuclides, e.g. F-18 and other positron emitters, extremely low and very reliable detection limits are achieved using coincidence counting. Coincidence counting improves the signal-to-noise ratio by one to two orders of magnitude as compared to integral gamma or positron measurements.
For stack monitoring at PET-facilities, the main advantage of this coincidence technique is that outside influences due to background do not interfere with the detectors measuring the effluent within the stack. Another advantage is that the calibration of the detector assembly is not influenced by the overall design and operation of the facility but only by the diameter of the duct and the size and spacing of the detectors.
Varying gamma backgrounds do not influence the coincidence technique used in the low level effluent monitoring. Depending on the number and size of the detectors used, detection limits well below 1 kBq/m3 can be achieved.
2 Artículos Total 7,258.00 USD 
