Palmans, H (2006) Effective water depth of an ionization chamber in a proton beam: analytical model. NPL Report. DQL-RD 002

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Abstract

An analytical model is described to calculate the effective depth in water of cylindrical ionization chambers in clinical proton or heavy ion beams in the presence of modest and linear gradients. The model is compared with Monte Carlo simulations and recommendations in IAEA TRS-398. An extension of the model allows applying it for depth-dose curves even in the non-linear gradient region of the Bragg peak. Combined with information from the Monte Carlo simulations it also allows one to solve the inverse problem of deriving a depth-dose curve in homogeneous water from the depthdose response obtained with a cylindrical ionization chamber.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DQL-RD 002
Subjects:	Ionising Radiation Ionising Radiation > Dosimetry
Last Modified:	02 Feb 2018 13:15
URI:	https://eprintspublications.npl.co.uk/id/eprint/3523