Broadening of the kappa-ray diffraction lines in teeth affected by fluorine.

THE diffraction of X-rays in the case of teeth can be investigated by a modification of the standard X-ray powder method, by producing biophysical specimens in the form of wires of tooth material by the careful cutting and filing of suitable pieces of tooth material. A 9 cm. camera of the Van Arkel type with filtered copper radiation has been used in comparing the diffraction lines from two specimens of teeth (one from a male and one from a female) which had been extracted following decay.