| Téléchargement | - Voir la version finale : The NRC sealed water calorimeter: correction factors and performance (PDF, 970 Kio)
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| Auteur | Rechercher : Ross, C. K.1; Rechercher : Seuntjens, J. P.1; Rechercher : Klassen, N. V.1; Rechercher : Shortt, K. R.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut des étalons nationaux de mesure du CNRC
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| Commanditaire | Rechercher : NPL |
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| Format | Texte, Article |
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| Conférence | Proceedings of NPL Workshop on Recent Advances in Calorimetric Absorbed Dose Standards, December 8-10, 1999, Teddinton, England |
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| Résumé | The NRC sealed water calorimeter is based on a design first proposed by Domen at the National Institute of Standards and Technology. Thermistor probes are used to measure the temperature increase at a point in a large water phantom due to energy absorbed from the radiation field. A sealed glass vessel is used to control the water quality near the measuring point. To eliminate convective heat transfer, the calorimeter is operated at 4oC. Apart from correction factors, the absorbed dose to water is obtained from the measured temperature change multiplied by the known specific heat of water. However, there are a number of corrections and perturbations which must be considered. Most of these factors are small and can be estimated accurately. The largest uncertainty (0.3%) is contributed by the heat defect, partly because it depends on knowledge of the radiation chemistry of water, and partly because of the difficulty of preparing high purity aqueous systems. The NRC calorimeter has been used to establish the absorbed dose in a ⁶⁰Co beam and several high energy x-ray beams with an estimated standard uncertainty of about 0.5%. The performance of the calorimeter, as well as some of the implications of the results obtained, will be reviewed. |
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| Date de publication | 2000-12-01 |
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| Maison d’édition | National Physical Laboratory |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRC-INMS-2304 |
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| Numéro NPARC | 8899883 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 3e2723d4-adcc-43e5-a78a-fe7d5c334469 |
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| Enregistrement créé | 2009-04-22 |
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| Enregistrement modifié | 2020-06-08 |
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