| Zugriffsnummer | 10433 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | The heat defect in the PTB water calorimeter: A discussion on uncertainty |
| Autor(in); Institution |
Krauss, Achim; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
Kramer, Hans-Michael; 6.2, Dosimetrie für die Strahlentherapie, PTB-Braunschweig
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| Quelle/Jahr | AbsDos 2003 proceedings:(2003), 10 S. |
| Availability | [Online only] |
| URL | |
| Konferenzangaben | Australian Radiation and Nuclear Safety Agency (ARPANSA): Workshop on Recent Advances in Absorbed Dose Standards, Sydney, 19-21, August, 2003, Australia |
| Freie Schlagworte | water calorimetry ; heat defect ; radiolysis ; absorbed dose to water |
| Zusammenfassung | Model calculations for the radiolysis of the so-called H2-system, i.e. high-purity water saturated with H2 gas, predict a zero heat defect independent on accumulated absorbed dose. The results of different calorimetric experiments using the H2-system, with each experiment involving several hundred single measurements, show a stable response within about 0.1 % over a dose range of more than 1.5 kGy. Furthermore, the statistical uncertainty of each calorimetric experiment is in the same order as the variation between the experiments. The question arises within what reasonable uncertainty the heat defect can be assumed to be zero (for the H2-system) or, in other words, whether a separate uncertainty for the heat defect can be determined from the experimental data in addition to the statistical uncertainty stated for each experiment. Furthermore, it is questioned, whether the measured stable response of the calorimeter might also be explained by a non-zero heat defect caused by unknown impurities in the water. The different points of view regarding the uncertainty of the heat defect in the PTB water calorimeter are discussed in depth. |
