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 | JOURNAL OF SYNCHROTRON RADIATION |
Absorbed dose calculations for macromolecular crystals: improvements to RADDOSE. Erratum
aLaboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK, and bSwiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
*Correspondence e-mail: elspeth.garman@bioch.ox.ac.uk
Corrections to an equation and a figure in the paper by Paithankar et al. (2009). [J. Synchrotron Rad. 16, 152–162] are made.
Keywords: absorbed dose; macromolecular crystallography; experimental dose limit; fluorescence escape; photoelectric absorption.
Correct versions of equation (5) and Fig. 4 and its legend in the paper by Paithankar et al. (2009)![[Paithankar, K. S., Owen, R. L. & Garman, E. F. (2009). J. Synchrotron Rad. 16, 152-162.]](../../../../../../logos/arrows/s_arr.gif "Paithankar, K. S., Owen, R. L. & Garman, E. F. (2009). J. Synchrotron Rad. 16, 152-162.")
. [J. Synchrotron Rad. 16, 152–162] are given. The last line on page 155 and equation (5) on page 156 should read as follows:
The fraction of μpe attributable to K-shell ionization (above the K-edge), μK(Ei), at an incident X-ray energy Ei is equal to (see Fig. 4):
![[\mu_K(E_i) = \left(\mu_{\rm{pe}}-{{\mu_{\rm{pe}}}\over{r}}\right) = \mu_{\rm{pe}}\left(1-{{1}\over{r}}\right) = \mu_{\rm{pe}}\left(1-{{\left(\mu-\mu_K\right)}\over{\mu}}\right), \eqno(5)]](teximages/xh9003fd1.gif)
where r is the `edge ratio', defined as μ/(μ − μK), and μ and μK are the total and K-shell photoelectric cross sections, respectively, at the K-edge.
(The revised version of Fig. 4 is given overleaf.)
![[Figure 4]](xh9003fig4thm.gif) | Figure 4 The photoelectric cross section of iron (top) and uranium (bottom) as a function of energy. μK, μL and μM are the contributions of the K-, L- and M-shell cross sections to the total photoelectric and r is the edge ratio: r = μ/(μ − μK) and μ/(μ − μL) at any K- and L-edge, respectively. |
Footnotes
‡Present address: Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK.
Acknowledgements
We thank Joshua L. Dickerson (University of Oxford, UK) for pointing out the error in the original paper.
References
Paithankar, K. S., Owen, R. L. & Garman, E. F. (2009). J. Synchrotron Rad. 16, 152–162. Web of Science CrossRef CAS IUCr Journals Google Scholar
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| JOURNAL OF SYNCHROTRON RADIATION |
