addenda and errata\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 1600-5775

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

(Received 5 February 2018; accepted 5 February 2018)

Corrections to an equation and a figure in the paper by Paithankar et al. (2009). [J. Synchrotron Rad. 16, 152–162] are made.

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.]. [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)]

where r is the `edge ratio', defined as μ/(μμK), and μ and μK are the total and K-shell photoelectric cross sections, respectively, at the K-edge.

(The revised version of Fig. 4[link] is given overleaf.)

[Figure 4]
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 cross section, and r is the edge ratio: r = μ/(μμK) and μ/(μμL) 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

First citationPaithankar, K. S., Owen, R. L. & Garman, E. F. (2009). J. Synchrotron Rad. 16, 152–162.  Web of Science CrossRef CAS IUCr Journals Google Scholar

© International Union of Crystallography. Prior permission is not required to reproduce short quotations, tables and figures from this article, provided the original authors and source are cited. For more information, click here.

Journal logoJOURNAL OF
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RADIATION
ISSN: 1600-5775
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