| Autor: |
de Prez LA; Nederland Meetinstituut, Thijsseweg 11, 2629 JA Delft, The Netherlands. ldeprez@umi.nl, de Pooter JA |
| Jazyk: |
angličtina |
| Zdroj: |
Physics in medicine and biology [Phys Med Biol] 2008 Jul 07; Vol. 53 (13), pp. 3531-42. Date of Electronic Publication: 2008 Jun 13. |
| DOI: |
10.1088/0031-9155/53/13/009 |
| Abstrakt: |
A new water calorimeter for orthovolt x-rays has been developed at NMi. The purpose of this calorimeter is to provide calibrations in terms of absorbed dose to water. Four internationally accepted CCRI qualities (100-250 kV) have been characterized. Correction factors have been determined with measurements, Monte Carlo calculations and heat transport models. The results of the calculations have been validated against measurements. The absorbed dose to water calibration coefficient, N(Dw,WCM), with the new calorimeter has been compared to the N(Dw,NCS) based on an air-kerma calibration coefficient, using the current NCS-10 dosimetry protocol. A good agreement is found for all beam qualities where the total uncertainty (1 SD) has decreased from 2.5% for N(Dw,NCS) to better than 1.5% for N(Dw,WCM), using the new water calorimeter. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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