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Reply to comment on 'origins of the changing detector response in small megavoltage photon radiation fields'
| Content Provider | Scilit |
|---|---|
| Author | Fenwick, John D. Georgiou, Georgios Rowbottom, Carl Graham Underwood, Tracy S. A. Kumar, Sudhir |
| Copyright Year | 2018 |
| Description | Journal: Physics in Medicine & Biology Andreo and Benmakhlouf (A-B 2017) have disputed a finding of Scott et al (2012) that the variation with field-size of the response of small ion chambers and solid-state dosimeters in small megavoltage photon radiation fields can largely be attributed to density. Further evidence for this finding was provided by Fenwick et al (2018), but A-B (2018) have now challenged the methodology used in that study. Specifically, A-B suggest that mass stopping-powers of fictitious materials used in Monte Carlo radiation transport calculations should be adjusted with material density according to the polarisation effect, as if the materials were real and created by compressing other real materials. In this reply, we observe that fictitious materials are not real, and therefore their densities, mass stopping-powers and microscopic radiation interaction cross-sections can be freely and independently chosen to provide the clearest answers to the questions being studied. And we note that the key role played by density in small field detector response was further confirmed by our group back in 2013, using fictitious materials in which mass stopping-powers were varied with density, as preferred by A-B, as well as being held fixed, with very similar results being obtained in both circumstances (Underwood et al 2013a). |
| Related Links | https://iopscience.iop.org/article/10.1088/1361-6560/aae0e4/pdf http://iopscience.iop.org/article/10.1088/1361-6560/aae0e4/pdf |
| ISSN | 00319155 |
| e-ISSN | 13616560 |
| DOI | 10.1088/1361-6560/aae0e4 |
| Journal | Physics in Medicine & Biology |
| Issue Number | 19 |
| Volume Number | 63 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-09-12 |
| Access Restriction | Open |
| Subject Keyword | Journal: Physics in Medicine & Biology Nuclear Energy and Engineering Detector Response |
| Content Type | Text |
| Subject | Radiology, Nuclear Medicine and Imaging Radiological and Ultrasound Technology |
