Accession Number:

AD0260478

Title:

PRINCIPLES OF A NARROW BAND X-RAY DETECTOR

Descriptive Note:

Corporate Author:

TRACERLAB INC WALTHAM MASS

Personal Author(s):

Report Date:

1961-03-27

Pagination or Media Count:

1.0

Abstract:

An x-ray detector is described whose counting efficiency is of substantial value only between two narrowly separated and sharply defined limits. While the efficiency within these limits is not a full 100, only rather moderate sacrifice in counting efficiency is required to obtain discrimination ratios of the order of one hundred or more. The principle of operation lies in the fact that the transmission and reflectance of materials of adjacent or nearly adjacent atomic number are both of substantial value for only a narrow band of energies, viz., those falling between the x-ray absorption edges of the two materials. A simplified mathematical treatment of this system is presented. A numerical example is also given for the case of transmission by silver Z 47 and reflection by palladium Z 46 and shows an upper limit of discrimination ratio of 4001 for a bandwidth of 1.2 kev centered at approximately 25 kev energy. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE