Intercomparison of french and U. S. roentgen ray standards

Physical aspects of irradiation: recommendations of the International Commission on Radiological Units and Measurements (ICRU) report 10B 1962

“…The estimated maximum uncertainty of about 0.5 percent is somewhat larger than that assigned to direct comparisons, though it is con¬ sidered that it should be possible to improve such transfer instruments so that indirect comparisons are almost as accurate as direct ones. Taking into account the greater uncertainty in the indirect comparisons by the circulation of these transfer instruments, the results of table IIA4 are con¬ sistent, where comparable, with those of earlier comparisons (Aston and Attix, 1956;Allisy et al, 1957) Free-air, cylindrical_ Thoraeus (1932Thoraeus ( ,1954. Thoraeus (1932Thoraeus ( , 1954 60 to 250_ _ ...do_ Wyckoff et al, (1954); Aston and Attix (1956).…”

Transfer of NBS X-ray beam calibrations

“…The electrometer was supplied by A. Allisy, and is identical with one he has used to compare X-ray standards at lower energies [5], except for t h e recent addition of an electronically stabilized power supply. This electrometer was used as a null instrument, with a 0.1 /.tf polystyrene capacitor, an d with an electronic power supply for the compensating vcltage.…”