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Collimation and background in the pulsed neutron activation method for determination of water flow in pipes

Håkan Mattsson (Institutionen för teknisk fysik, Nukleär teknik) ; Anders Nordlund (Institutionen för teknisk fysik, Nukleär teknik) ; Berit Dahl (Institutionen för teknisk fysik, Nukleär teknik)
International Journal of Nuclear Energy Science and Technolpgy (1741-6361). Vol. 3 (2007), 1, p. 12.
[Artikel, refereegranskad vetenskaplig]

In a Pulsed Neutron Activation (PNA) flowmeter, the water in a pipe is bombarded with neutron pulses, which introduce activity into the pipe. The activity is mixed with the flow, and gamma radiation emitted from the activity is measured with a detector downstream. The average velocity of the water is then calculated using the time-resolved detector signal. In this paper, the effect of collimation of the neutron radiation has been investigated. Such a collimation would increase the accuracy of the measurement, but the use of a collimator requires the distance between the pipe and the neutron source to be increased, with a corresponding loss in count rate. The results show that this loss makes neutron collimators in PNA of little use. In addition, a method to identify and subtract the background originating from stationary sources in a PNA measurement was developed.

Nyckelord: Pulsed neutron activation, PNA, pipe flow,

Denna post skapades 2008-07-30.
CPL Pubid: 72580


Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)



Chalmers infrastruktur