Accession Number : AD0250512

Title :   SOFT X-RAY PHOTON COUNTER STABILIZATION OF SOURCE

Corporate Author : CORNELL UNIV ITHACA NY

Personal Author(s) : TOMBOULIAN, D.H.

Report Date : NOV 1960

Pagination or Media Count : 1

Abstract : IT WAS PREVIOUSLY SHOWN (TECH. REPT. 2 AND 3) THAT THE PRECISION OF ABSORPTION MEASUREMENTS COULD BE IMPROVED IF FLUCTUATIONS IN THE INCIDENT BEAM OF RADIATION WERE REDUCED. THE VARIATIONS IN THE INTENSITY OF THE INCIDENT BEAM ARISE PRIMARILY FROM INSTABILITIES IN THE TARGET POTENTIAL AND CURRENT; THIS IS BASED ON THE FACT THAT PHOTON FLUX DEPENDS DIRECTLY ON THE NUMBER OF BOMBARDING ELECTRONS PER SECOND AND ON THE TARGET VOLTAGE V IN ACCORDANCE WITH THE EMPIRICAL RELATION (V/V SUB 0-1) TO THE NTH POWER WHEN V IS GREATER THAN V SUB 0. THE DEPENDENCE GIVEN IN THIS RELATION IS VALID FOR LINE SOURCES, V SUB 0, BEING THE EXCITATION POTENTIAL OF THE LINE OR EMISSION BAND USED. THE EXPONENT N IS FOUND TO BE IN THE NEIGHBORHOOD OF 5/3. SCHEMES ARE ADOPTED FOR REGULATING THE X-RAY TUBE CURRENT AND POTENTIAL

Descriptors :   *CURRENT REGULATORS, *ELECTRON TUBES, *VOLTAGE REGULATORS, *X RAYS, PHOTONS, STABILIZATION.

Distribution Statement : APPROVED FOR PUBLIC RELEASE