The Journal of Instytut Chemii i Techniki Jadrowej

Nukleonika

Nukleonika ONL

<abstract><title style='display:none'>Abstract</title><sec><title style='display:none'>Purpose</title>According to the available international recommendations, at least one independent verification of the calculations of number of monitor unit (MU) is required for every patient treated by teleradiotherapy. The aim of this study was to estimate the differences of dose distributions calculated with two treatment planning systems: Eclipse (Varian) and Oncentra MasterPlan (Elekta).</sec><sec><title style='display:none'>Materials and methods</title>The analysis was performed for 280 three-dimensional conformal radiotherapy treatment (3D-CRT) plans with photon beams from Varian accelerators: CL 600C/D X6 MV (109 plans), CL 2300C/D X6 MV (43 plans), and CL 2300C/D X15 MV (128 plans). The mean doses in the planning target volume (PTV) and doses at the isocenter point obtained with Eclipse and Oncentra MasterPlan (OMP) were compared with Wilcoxon matched-pairs signed rank test. Additionally, the treatment planning system (TPS) calculations were compared with dosimetric measurements performed in the inhomogeneous phantom.</sec><sec><title style='display:none'>Results</title>Data were analysed for 6 MV plans and for 15 MV plans separately, independently of the treatment machine. The dose values calculated in Eclipse were significantly (<italic>p</italic> &lt;0.001) higher compared to calculations of OMP system. The average difference of the mean dose to PTV was (1.4 ± 1.0)% for X6 MV and (2.5 ± 0.6)% for X15 MV. Average dose disparities at the isocenter point were (1.3 ± 1.9)% and (2.1 ± 1.0)% for X6 MV and X15 MV beams, respectively. The largest differences were observed in lungs, air cavities, and bone structures. Moreover the variation in dosimetric measurements was less as compared to Eclipse calculations.</sec><sec><title style='display:none'>Conclusions</title>OMP calculations were introduced as the independent MU verification tool with the first action level range equal to 3.5%.</sec></abstract>

Abstract

Maria Sklodowska-Curie Memorial Cancer, Center and Institute of Oncology, Department of Medical Physics

Faculty of Physics, Biomedical Physics Division

Keywords

<article-title>Independent verification of treatment planning system calculations</article-title>

Independent verification of treatment planning system calculations

<table frame="hsides" rules="groups"><thead><tr><th align="center" valign="middle">Energy</th><th align="center" valign="middle">Plans</th><th align="center" valign="middle">Average (%) ± STD (%)</th><th align="center" valign="middle">Range (%)</th><th align="center" valign="middle"><italic>p</italic>-value (<italic>p</italic> &lt;0.001)</th></tr></thead><tbody><tr><td align="center" valign="middle" colspan="5">Mean dose with inhomogeneity correction</td></tr><tr><td align="center" valign="middle" colspan="5"><hr/></td></tr><tr><td align="left" valign="top">X6 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">1.3 ± 0.5</td><td align="center" valign="top">0.1, 2.1</td><td align="center" valign="top">0.000</td></tr><tr><td align="left" valign="top">X15 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">2.6 ± 0.6</td><td align="center" valign="top">1.6, 4.5</td><td align="center" valign="top">0.000</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="center" valign="top" colspan="5">Dose at isocenter with inhomogeneity correction</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="left" valign="top">X6 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">1.1 ± 1.5</td><td align="center" valign="top">−1.0, 6.8</td><td align="center" valign="top">0.000</td></tr><tr><td align="left" valign="top">X15 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">2.2 ± 1.1</td><td align="center" valign="top">0.4, 5.2</td><td align="center" valign="top">0.000</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="center" valign="top" colspan="5">Mean dose without inhomogeneity correction</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="left" valign="top">X6 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">0.4 ± 0.4</td><td align="center" valign="top">−0.8, 1.0</td><td align="center" valign="top">0.000</td></tr><tr><td align="left" valign="top">X15 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">1.0 ± 0.3</td><td align="center" valign="top">0.5, 1.6</td><td align="center" valign="top">0.000</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="center" valign="top" colspan="5">Dose in isocenter without inhomogeneity correction</td></tr><tr><td align="center" valign="top" colspan="5"><hr/></td></tr><tr><td align="left" valign="top">X6 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">0.2 ± 0.7</td><td align="center" valign="top">−1.0, 2.4</td><td align="center" valign="top">0.110</td></tr><tr><td align="left" valign="top">X15 MV</td><td align="center" valign="top">24</td><td align="center" valign="top">0.5 ± 0.9</td><td align="center" valign="top">−2.1, 2.8</td><td align="center" valign="top">0.001</td></tr></tbody></table>

{"article-title":"Independent verification of treatment planning system calculations"}

<abstract><title style='display:none'>Abstract</title>A new kind of 125I seeds with a core-shell structure were synthesized by an easy assembling–disassembling coaxial capillaries microfluidic device. The dose distribution of a 125I brachytherapy source fabricated by arranging six 125I seeds collinearly within a cylindrical titanium capsule was simulated by modelling the source in a water phantom using Monte Carlo N-Particle Transport code. The influence of the motion and the core size of the 125I seeds on the dose distribution was also studied in this work.</abstract>

University of Science and Technology of China

Department of Engineering and Applied Physics

<article-title>Design and fabrication of 125I seeds for brachytherapy using capillary-based microfluidic technique</article-title>

Design and fabrication of I seeds for brachytherapy using capillary-based microfluidic technique

<abstract><title style='display:none'>Abstract</title>Actinium-225 is used in nuclear medicine for the treatment of malignant tumours. It can be applied to produce Bi-213 in a reusable generator or can be used alone as an agent for radiation therapy, in particular for targeted alpha therapy. However, the availability of Ac-225 for worldwide use, particularly in low- and middle-income countries, is limited. We present a feasibility study employing GATE, an open-source Monte Carlo simulation toolkit, on the production of Ac-225 from a neutron generator. This work suggests that a design consisting of three concentric cylinders, the innermost a Cf-252 neutron source, the middle nickel cylinder acting as a proton-producing target and the outer cylinder a RaCl2 target may provide a feasible design outline for an Ac-225 generator.</abstract>

Faculty of Engineering, Department of Nuclear Engineering

Center for Training & Radiation Prevention

Department of Medical Physics & Biomedical Engineering, Malet Place Engineering Building

<article-title>Production of actinium-225 from a (n,p) reaction: Feasibility and pre-design studies</article-title>

Production of actinium-225 from a (n,p) reaction: Feasibility and pre-design studies

<abstract><title style='display:none'>Abstract</title>To assure the credibility of commodity transfer operations in the oil and gas industry, calibrated flow meters are used to quantify the movement of fluids in the pipelines. The purpose of this paper is to validate the transient time method (TTM) to calibrate oil flow meters installed in restricted areas, using the 123I-labelled oil as a radiotracer. Traditionally, as proposed by the standard ISO 2975-7:1977 [<xref ref-type="bibr" rid="j_nuka-2021-0009_ref_001">1</xref>] for experiments in an aqueous medium, the TTM is employed by positioning two detectors at separate locations. However, in industrial plants, it is not always possible to install detectors at the distances recommended by the ISO 2975-7. The method proposed in this paper uses four scintillator detectors separated one from each other by 0.30 m and three injections containing 5.0 ml of 123I-labelled oil. The experiments were carried out in an oil flow rig with a turbulent flow profile. The results have reached an uncertainty which is lower than 1.0%.</abstract>

Federal University of Rio de Janeiro (COPPE/UFRJ)

<article-title>Validation of transient time method to calibrate oil flow meters in closed conduits using 123I as the radiotracer</article-title>

Validation of transient time method to calibrate oil flow meters in closed conduits using I as the radiotracer

<abstract><title style='display:none'>Abstract</title>In recent years, naturally occurring radioactive materials (NORM) have become an important topic from the perspective of environmental protection. The list of isotopes that should be monitored in the environment is constantly growing as new amendments to international legislation are introduced. One of the often studied NORM elements is 210Po. In this study, a process of elaborating of a new method of 210Po determination in soil was presented. In the proposed method, several analytical aspects, like the influence of silica decomposition or optimization of an electrode material, were revised. The obtained procedure allows performance of complete radiochemical analysis in a single day, with the chemical efficiency of over 85% and great reduction of costs. Further, the influence of the use of phosphate fertilizers on polonium concentration in soil was also confirmed.</abstract>

NCBJ – National Centre for Nuclear Research, Department of Nuclear Safety & Radiation Protection

<article-title>Optimization of 210Po determination in soil</article-title>

{"article-title":{"content":["Optimization of","Po determination in soil"],"sup":210}}

<div>The Authors regret that there was a mistake in the affiliation of Dr Marek Dohojda published in the final version of the article.The correct affiliation of the Author is given below.M. DohojdaWarsaw University of Life Sciences - SGGW, Faculty of Civil and Environmental Engineering Nowoursynowska 159 Str., 02-776 Warsaw, Poland</div>

<article-title>Erratum to “Radon incomparison tests – Katowice, 2016” [Nukleonika 2020;65(2):127-132, doi:10.2478/nuka-2020-0020]</article-title>

Erratum to “Radon incomparison tests – Katowice, 2016” [Nukleonika 2020;65(2):127-132, doi:10.2478/nuka-2020-0020]

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Editor-in-Chief Andrzej G. Chmielewski, Institute of Nuclear Chemistry and Technology, Poland Editorial Advisory Board Krzysztof Andrzejewski, National Centre for Nuclear Research, Poland Henryk Anglart, Royal Institute of Technology, Sweden Jacqueline Belloni, Universite Paris Saclay, France Delphine Dean, Clemson University, USA Andrzej Gałkowski, Institute of Plasma Physics and Laser Microfusion, Poland Evgeni A. Krasavin, Joint Institute for Nuclear Research, Russia Marek Lankosz, AGH University of Science and Technology, Poland Stanisław Latek, Institute of Nuclear Chemistry and Technology, Poland Dan Meisel, University of Notre Dame, USA Jacek Michalik, Institute of Nuclear Chemistry and Technology, Poland Christian Streffer, University of Duisburg-Essen, Germany Alexander Van Hook, University of Tennessee, USA Editors Nuclear Chemistry Jacek Michalik, Institute of Nuclear Chemistry and Technology, Poland Nuclear Engineering Andrzej G. Chmielewski, Institute of Nuclear Chemistry and Technology, Poland Nuclear Medicine Irena Szumiel, Institute of Nuclear Chemistry and Technology, Poland Nuclear Physics Andrzej Gałkowski, Institute of Plasma Physics and Laser Microfusion, Poland Technical Editors Bożena Bursa, Institute of Nuclear Chemistry and Technology, Poland Contact <A href="mailto:nukleon@ichtj.waw.pl">nukleon@ichtj.waw.pl</A> Publisher De Gruyter Poland Bogumiła Zuga 32A Str. 01-811 Warsaw, Poland

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