Determination of the sensitive volume of a spherical ion chamber as a potential primary standard instrument for higher energy photon beams

IF 1.6 3区物理与天体物理 Q2 NUCLEAR SCIENCE & TECHNOLOGY

Radiation Measurements Pub Date : 2025-03-05 DOI:10.1016/j.radmeas.2025.107416

Larry A. DeWerd , Carlos E. de Almeida , Olga M.O. de Araújo , Karen Rex Pius Vincent , Ahtesham Ullah Khan , Leo Franco , Ricardo Tadeu Lopes

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Abstract

The sensitive volume of cylindrical or parallel plate ion chamber used as a primary standard for air kerma is typically determined using mechanical tools. This study presents an alternative methodology to determine the sensitive volume for a spherical chamber using a high-resolution imaging system, such as a microcomputed tomography unit (microCT). These determinations were done independently at both the University of Wisconsin (UW) and at State University of Rio de Janeiro (UERJ). The internal dimensions and the collection electrode of a spherical chamber (model Exradin® A3, Standard Imaging) were determined with a resolution better than the manufacturer's nominal volume value of 3.6 cm³ for the A3. In this study, at UERJ the measured sensitive volume of the A3 chamber was found to be 3.52 cm³ and at UW, after a correction for the electric field was made for the volume determination, it was found to be 3.54 cm³. The measured sensitive volume was compared against the volume calculated from an ADCL air kerma calibration with ⁶⁰Co at the UW. The agreement between these two methods was within 0.65%. Note that the chambers at UW and UERJ are two independent chambers and thus, the volume would not necessarily agree.

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来源期刊

Radiation Measurements 工程技术-核科学技术

CiteScore

4.10

自引率

20.00%

发文量

116

审稿时长

48 days

期刊介绍： The journal seeks to publish papers that present advances in the following areas: spontaneous and stimulated luminescence (including scintillating materials, thermoluminescence, and optically stimulated luminescence); electron spin resonance of natural and synthetic materials; the physics, design and performance of radiation measurements (including computational modelling such as electronic transport simulations); the novel basic aspects of radiation measurement in medical physics. Studies of energy-transfer phenomena, track physics and microdosimetry are also of interest to the journal. Applications relevant to the journal, particularly where they present novel detection techniques, novel analytical approaches or novel materials, include: personal dosimetry (including dosimetric quantities, active/electronic and passive monitoring techniques for photon, neutron and charged-particle exposures); environmental dosimetry (including methodological advances and predictive models related to radon, but generally excluding local survey results of radon where the main aim is to establish the radiation risk to populations); cosmic and high-energy radiation measurements (including dosimetry, space radiation effects, and single event upsets); dosimetry-based archaeological and Quaternary dating; dosimetry-based approaches to thermochronometry; accident and retrospective dosimetry (including activation detectors), and dosimetry and measurements related to medical applications.