000			02046 am a22002173u 4500
042			_adc
100	1	0	_aLee, R. M. _eauthor _9255
700	1	0	_aLoftus, T. P. _eauthor _9256
245	0	0	_aCorrection Factors for the Calibration of Encapsulated Radium Sources
260			_b[Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology, _c1962.
500			_a/pmc/articles/PMC5315329/
520			_aSeveral aspects of the procedure and corrections for the calibration of encapsulated radium sources at NBS have recently been investigated. It was found that a chamber equipped with a guard-ring type electrode system allowing the use of a vibrating reed electrometer as a current detector provides more versatility and precision than the gold-leaf electroscope now in use for routine calibrations. Absorption corrections for the U.S. primary national radium standards have been determined for the NBS chamber: 0.78 percent for standard 5440 and 1.01 percent for standard 5437. The Owen-Naylor integral equation for absorption of rays in the walls of cylindrical radium sources has been evaluated by a power series expansion of the integrand. Absorption coefficients and correction factors for platinum and Moael metal (materials commonly used for source capsules) have been computed for the NBS chamber.
540			_a
540			_ahttps://creativecommons.org/publicdomain/zero/1.0/
540			_aThe Journal of Research of the National Bureau of Standards Section A is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
546			_aen
690			_aArticle _9257
655	7		_aText _2local _9258
786	0		_nJ Res Natl Bur Stand A Phys Chem
856	4	1	_uhttp://dx.doi.org/10.6028/jres.066A.011 _zConnect to this object online.
999			_c93 _d93