Using a dose-area product for absolute measurements in small fields: a feasibility study
To extend the dosimetric reference system to field sizes smaller than 2 cm × 2 cm, the LNE-LNHB laboratory is studying an approach based on a new dosimetric quantity named the dose-area product instead of the commonly used absorbed dose at a point. A graphite calorimeter and a plane parallel ion c...
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| Veröffentlicht in: | Physics in medicine & biology 2016-01, Vol.61 (2), p.650-662 |
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| container_title | Physics in medicine & biology |
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| creator | Dufreneix, S Ostrowsky, A Le Roy, M Sommier, L Gouriou, J Delaunay, F Rapp, B Daures, J Bordy, J-M |
| description | To extend the dosimetric reference system to field sizes smaller than 2 cm × 2 cm, the LNE-LNHB laboratory is studying an approach based on a new dosimetric quantity named the dose-area product instead of the commonly used absorbed dose at a point. A graphite calorimeter and a plane parallel ion chamber with a sensitive surface of 3 cm diameter were designed and built for measurements in fields of 2, 1 and 0.75 cm diameter. The detector surface being larger than the beam section, most of the issues linked with absolute dose measurements at a point could be avoided. Calibration factors of the plane parallel ionization chamber were established in terms of dose-area product in water for small fields with an uncertainty smaller than 0.9%. |
| doi_str_mv | 10.1088/0031-9155/61/2/650 |
| format | Article |
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| subjects | absolute dosimetry Calorimetry - instrumentation Calorimetry - methods Calorimetry - standards dose-area product dosimetric reference Feasibility Studies Graphite Instrumentation and Detectors Nuclear Experiment Physics Radiometry - instrumentation Radiometry - methods small fields |
| title | Using a dose-area product for absolute measurements in small fields: a feasibility study |
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