The determination of electron density by the dual-energy Compton scatter method

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Abstract
The intensity of Compton scattered photons is directly proportional to the electron density of a substance; therefore it is possible to detect changes in electron density by this noninvasive method. The source-detector geometry was varied to study the effects of geometry on the calculated electron density values, using a 90.degree. scattering angle. The dual-energy Compton scatter method provides a determination of electron density in known samples, with an uncertainty of less than 1% for the optimal geometry. The effective linear attenuation coefficient for Compton scatter was determined with an uncertainty of 2.1-3.6% for the optimal geometry used. The applications of the dual-energy Compton scattering technique in radiotherapy dosimetry and skeletal bone densitometry are being investigated.

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