Least squares fit of calculated to measured gamma intensity traversing two quasi aligned rebars (diameters 16 mm and 8 mm) using a Co60 source and a collimated NaI spectrometer.
Gammametry is the technique that uses spectrometers, instead of plates, to detect the gamma radiation transmitted through a body.
This technological alternative is
advantageous in some cases, such as the examination of zones deep inside
the concrete. In particular, gammametry allows the implementation of
digital, real time tomography with greater efficiency and better contrast
This is due to the spectrometer´s larger
thickness and to the possibility of electronically filtering out the
scattered radiation produced when a piece of concrete is irradiated.
THASA has applied gammametry in a variety
of cases and is currently developing a prototype process for real time
APPLICATION OF GAMMAMETRY TO THE STUDY OF UNDERGROUNG PIPES
(Argentine Patent P-99-01-00863, March 1, 2000)