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

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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:

(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.


Present address: Diamond Light Source Ltd, Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK.


We thank Joshua L. Dickerson (University of Oxford, UK) for pointing out the error in the original paper.


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

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