β Scribed by Edgar T. Wherry
No coin nor oath required. For personal study only.
ASOUT seventy-five minerals which have been found to possess radio-detector properties are tabulated with respect to their compositions. Sulphides are usually better than oxides of the same metals; selenides are sometimes better than sulphides. Most of these minerals are moderate conductors of low-voltage electricity. The theory of Roberts and Adams that sensitive spots on crystals are merely layers composed wholly of one kind of atom, is shown to be insufficient, and a modification is suggested. In some cases such layers are perpendicular to "hemimorphic" or polar axes, and the detector properties may be due to the corresponding one-sided attraction of the electron layers. In most minerals the presence of certain impurities improves the detector properties, which may be due to resulting irregularities in the crystal structure, with corresponding one-sided attractive forces holding groups of electrons.
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