Gammametry

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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 than gammagraphy.

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 tomography. 
The plot on the left illustrates the measurement of two quasi-aligned rebars.

 

more information

APPLICATION OF GAMMAMETRY TO THE STUDY OF UNDERGROUNG PIPES

(Argentine Patent P-99-01-00863, March 1, 2000)