Abstract
Identification of scale from out-side the pipe without having to stop the station may have some economical advantage. There is a possibility that scale can be removed while the plant is in operation by some chemical method.
In this technique neutrons from a neutron source such as
241 Am -
9Be are allowed to interact with the pipe material. Some of these neutrons are absorbed by the scale materials or by pipe material. Immediately after absorption they will emit gamma-ray photons which are characteristics of the materials. Their intensity will be proportional to the amount of scale while their energy will indicate the type of elements of the scale. Pure Ge gamma detector with multichannel analyzer can be used for measuring the energy and intensity of these photons. By using this technique it was possible to identify CaSO
4, and other deposits.