Bass, G A; Shipley, D R; Flynn, S; Thomas, R A S (2023) A Prototype Low-cost Secondary Standard Calorimeter for Reference Dosimetry with Ultra-high Pulse Dose Rates. The British Journal of Radiology, 96 (1141). 20220638

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Abstract

Calorimeters are widely used in national measurement institutes around the world as primary standards of absorbed dose for conventional radiotherapy dosimetry, including the National Physical Laboratory (NPL) in the UK. They are commonly regarded as devices operated only in standards laboratories but the concept of calorimeters for reference dosimetry in the clinic, instead of ionisation chambers, is not a new one and NPL has been developing calorimeters specifically for use in the clinical setting since the 1990s.
This work explores the feasibility of a simple, low-cost secondary standard calorimeter (SSC) that is dimensionally similar to a Roos-type parallel plate ionisation chamber, primarily though not exclusively intended for clinical ultra-high pulse dose rate (UHPDR) modalities. The SSC has not been comprehensively characterised, but initial results are reported here including a calibration in terms of absorbed dose to water using conventional 6, 10 and 15 MV x-rays, with a total estimated uncertainty of ± 2 % (k=2), and further measurements in a conventional 20 MeV electron beam and research 28 MeV proton beam.

Item Type:	Article
Subjects:	Ionising Radiation > Dosimetry
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1259/bjr.20220638
Last Modified:	09 Jun 2023 12:59
URI:	https://eprintspublications.npl.co.uk/id/eprint/9751