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Professor Paul Johns, Department of Physics

Welcome to Paul Johns' Homepage

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X rays were discovered in 1895 and applied shortly thereafter to medicine, but most of the subsequent developments in x-ray imaging have been linear enhancements to sources and detectors, leaving the basic physics yet to be fully harnessed. Over the past decade, the implementation of various digital imaging receptor technologies in hospitals and clinics, with the retirement of x-ray film, has made many new possibilities practical.

I do research at the "front end" of x-ray imaging, particularly on systems for using scattered radiation and dual-energy radiography. My work is split between research on campus at Carleton and occasional field work at the Canadian Light Source synchrotron in Saskatoon.

My graduate students generally do a mix of experiment, modelling, and computation. It's a time of new ideas in the world of x rays!

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