Polarization of Hard X-Rays

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Abstract
A study has been made of the polarization of x-rays scattered at 90° from the primary beam for various voltages ranging from 80 to 800 kilovolts. The scattered rays were again scattered at 90° and a Geiger-Müller counter was used to determine the relative intensities of the tertiary rays in directions parallel and perpendicular to the primary rays. At 80 kilovolts the polarization was found to be practically complete, but it was found to decrease to 69.6 percent as the x-ray tube voltage was raised to 800 kilovolts. Within the limits of experimental error, the results agree with Nishina's theory which predicts an unpolarized component in the secondary x-rays increasing in relative magnitude as the frequency of the primary rays becomes greater.

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