| Download | - View final version: The NRC sealed water calorimeter: correction factors and performance (PDF, 970 KiB)
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| Author | Search for: Ross, C. K.1; Search for: Seuntjens, J. P.1; Search for: Klassen, N. V.1; Search for: Shortt, K. R.1 |
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| Affiliation | - National Research Council of Canada. NRC Institute for National Measurement Standards
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| Sponsor | Search for: NPL |
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| Format | Text, Article |
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| Conference | Proceedings of NPL Workshop on Recent Advances in Calorimetric Absorbed Dose Standards, December 8-10, 1999, Teddinton, England |
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| Abstract | 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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| Publication date | 2000-12-01 |
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| Publisher | National Physical Laboratory |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRC-INMS-2304 |
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| NPARC number | 8899883 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 3e2723d4-adcc-43e5-a78a-fe7d5c334469 |
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| Record created | 2009-04-22 |
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| Record modified | 2020-06-08 |
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