Cecilia Kessler et al 2009 Metrologia 46 L24 doi:10.1088/0026-1394/46/5/N02
Cecilia Kessler, David T Burns and Penelope J Allisy
Show affiliationsFollowing the change to the BIPM standard for air kerma in 60Co adopted in November 2007, a re-evaluation of the BIPM standard for air kerma in 137Cs radiation has been made. The changes to the air-kerma rate determination arise from three sources: (i) the results of Monte Carlo calculations of correction factors for the standard; (ii) a re-evaluation of the correction factor for saturation; (iii) a new evaluation of the air volume of the standard using an experimental chamber of variable volume. The combined effect of these changes is an increase in the BIPM determination of the air-kerma rate by the factor 1.0030 and a reduction in the relative standard uncertainty of this determination to 1.9 parts in 103. A full uncertainty budget is presented.
Issue 5 (October 2009)
Received 19 June 2009, in final form 10 August 2009
Published 17 September 2009
Cecilia Kessler et al 2009 Metrologia 46 L24
David T Burns et al 2009 Metrologia 46 L21
Shradha Mishra et al J. Stat. Mech. (2010) P02003
E W Schmidt et al 2009 J. Phys.: Conf. Ser. 163 012028
D. V. Lukić et al. 2007 ApJ 664 1244
D W Savin 2007 J. Phys.: Conf. Ser. 88 012071
P. Bryans et al. 2009 ApJ 691 1540
M. Lestinsky et al. 2009 ApJ 698 648
M. F. Hasoğlu et al 2006 ApJ 649 L149
M. Fogle et al. 2008 ApJS 175 543