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Correction factors for thick-walled ionisation chambers in point-source photon beams
| Content Provider | Scilit |
|---|---|
| Author | Bielajew, A. F. |
| Copyright Year | 1990 |
| Description | Journal: Physics in Medicine & Biology In absolute exposure and air kerma measurements, such as those performed at Standards' laboratories, axial and radial nonuniformity correction factors are used to account for the nonuniformity of the incident photon field in the vicinity of the ionisation-chamber cavity. A theory for calculating the correction due to source nonuniformity is developed which applies to thick-walled ionisation chambers irradiated by point-source photon field with arbitrary incident energy distributions. The equations are derived within the framework of a fundamental theory of ionisation-chamber response and are suitable for Monte Carlo calculation. Monte Carlo calculations for estimating the correction in pancake, cylindrical and spherical geometries are described and comparisons with the experimental results of Kondo and Randolph indicate agreement to better than 0.5% demonstrating the viability of the theory under even the most extreme measurement conditions. |
| Related Links | http://iopscience.iop.org/article/10.1088/0031-9155/35/4/003/pdf |
| Ending Page | 516 |
| Page Count | 16 |
| Starting Page | 501 |
| ISSN | 00319155 |
| e-ISSN | 13616560 |
| DOI | 10.1088/0031-9155/35/4/003 |
| Journal | Physics in Medicine & Biology |
| Issue Number | 4 |
| Volume Number | 35 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Physics in Medicine & Biology Spherical Geometry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Radiological and Ultrasound Technology |
