The LNE-LNHB water calorimeter for primary measurement of absorbed dose at low depth in water: application to medium-energy x-rays

B. Rapp 1, * N. Perichon 1 M Denoziere 1 J. Daures 1 A. Ostrowsky 1 J-M Bordy 1
* Corresponding author
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : Water calorimeters are used to establish absorbed dose standards in several national metrology laboratories involved in ionizing radiation dosimetry. These calorimeters have been first used in high-energy photons of (60)Co or accelerator beams, where the depth of measurement in water is large (5 or 10 cm). The LNE-LNHB laboratory has developed a specific calorimeter which makes measurements at low depth in water (down to 0.5 cm) easier, in order to fulfil the reference conditions required by the international dosimetry protocols for medium-energy x-rays. This new calorimeter was first used to measure the absorbed dose rate in water at a depth of 2 cm for six medium-energy x-ray reference beams with a tube potential from 80 to 300 kV. The relative combined standard uncertainty obtained on the absorbed dose rate to water is lower than 0.8%. An overview of the design of the calorimeter is given, followed by a detailed description of the calculation of the correction factors and the calorimetric measurements.
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Submitted on : Friday, June 15, 2018 - 11:09:01 AM
Last modification on : Wednesday, September 4, 2019 - 1:40:15 PM

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B. Rapp, N. Perichon, M Denoziere, J. Daures, A. Ostrowsky, et al.. The LNE-LNHB water calorimeter for primary measurement of absorbed dose at low depth in water: application to medium-energy x-rays. Physics in Medicine and Biology, IOP Publishing, 2013, 58, pp.2769 - 2786. ⟨10.1088/0031-9155/58/9/2769⟩. ⟨cea-01816383⟩

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