9—2.
GAS-FILLED X-RAY TUBES
193
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A third type known as uorescent X-rays may be produced by
matter through Which primary X—rays are passing. They Will be
discussed in the section on Absorption Processes.
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9—2.
Gas—lled X—ray Tubes—Early in the studies of X-rays
it was found that greater-intensities couldbe obtained by the use
.
of materials of high atomic weight as the target upon Which the
electrons impinged. A simple gas-lled tube is shownin gure 9—2
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