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On the definition of absorbed dose
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Section of Medical Physics.
2015 (English)In: Radiation Physics and Chemistry, ISSN 0969-806X, Vol. 107, 131-135 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: The quantity absorbed dose is used extensively in all areas concerning the interaction of ionizing radiation with biological organisms, as well as with matter in general. The most recent and authoritative definition of absorbed dose is given by the International Commission on Radiation Units and Measurements (ICRU) in ICRU Report 85. However, that definition is incomplete. The purpose of the present work is to give a rigorous definition of absorbed dose. Methods: Absorbed dose is defined in terms of the random variable specific energy imparted. A random variable is a mathematical function, and it cannot be defined without specifying its domain of definition which is a probability space. This is not done in report 85 by the ICRU, mentioned above. Results: In the present work a definition of a suitable probability space is given, so that a rigorous definition of absorbed dose is possible. This necessarily includes the specification of the experiment which the probability space describes. In this case this is an irradiation, which is specified by the initial particles released and by the material objects which can interact with the radiation. Some consequences are discussed. Specific energy imparted is defined for a volume, and the definition of absorbed dose as a point function involves the specific energy imparted for a small mass contained in a volume surrounding the point. A possible more precise definition of this volume is suggested and discussed. Conclusions: The importance of absorbed dose motivates a proper definition, and one is given in the present work. No rigorous definition has been presented before. (C) 2014 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2015. Vol. 107, 131-135 p.
Keyword [en]
Absorbed dose, Radiation dosimetry
National Category
Chemical Sciences Physical Sciences Atom and Molecular Physics and Optics
URN: urn:nbn:se:uu:diva-244476DOI: 10.1016/j.radphyschem.2014.10.008ISI: 000347578500022OAI: oai:DiVA.org:uu-244476DiVA: diva2:790808
Available from: 2015-02-25 Created: 2015-02-17 Last updated: 2015-02-25Bibliographically approved

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