Divergent-Beam X-Ray Photography

Abstract

MANY papers have been published already on this subject—more recently especially by Mrs. Lonsdale¹. From her investigations it appears that the divergent pattern can give information regarding the perfection of the crystal investigated. As I was interested in differences in perfection between the crystals in recrystallized aluminium, it seemed, therefore, worth while to try to obtain divergent-beam photographs of aluminium single crystals. The methods of Kossel (crystal used as anode in a specially designed X-ray tube) and of Borrmann (fluorescent radiation of the crystal itself) cannot be used in this case (for a review of their work see ref. 2). A point source of characteristic X-ray radiation is therefore necessary, and special X-ray tubes for this purpose have been developed by various investigators. In view of the long time required to construct such a tube, we sought to solve the problem in such a way that a normal sealed-off tube could be used.