A Dosemeter Based on Nuclear Track Etched Detectors for Thermal, Fast and High Energy Neutrons with Flat Response

Bouassoule, T.; Fernández, F.; Marı́n, M.; Tomás, María Jesús Espuny i

doi:10.1093/oxfordjournals.rpd.a032879

Cited by 12 publications

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“…Furthermore, these techniques are not useful for in-phantom measurements. On the contrary, thanks to their relatively small size, passive detectors like TLD, PADC and FNTD are options for in-phantom measurements(Piesch and Burgkhardt 1985, Bouassoule et al 1999, Akselrod and Kouwenberg 2018. Li-based TLDs are good candidates for thermal/epithermal neutrons, but their efficiency drops for energies higher than 10 MeV at 1 % of their sensitivity at 1 eV(Piesch and Burgkhardt 1985), being therefore not the best choice in such high neutron energy fields.…”

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confidence: 99%

Assessment of secondary neutrons in particle therapy by Monte Carlo simulations

et al. 2022

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Objective: The purpose of this study is to estimate the energy and angular distribution of secondary neutrons inside a phantom in hadron therapy, which will support decisions on detector choice and experimental setup design for in-phantom secondary neutron measurements. Approach: Dedicated Monte Carlo simulations were implemented, considering clinically relevant energies of protons, helium and carbon ions. Since scored quantities can vary from different radiation transport models, the codes FLUKA, TOPAS and MCNP were used. The geometry of an active scanning beam delivery system for heavy ion treatment was implemented, and simulations of pristine and spread-out Bragg peaks were carried out. Previous studies, focused on specific ion types or single energies, are qualitatively in agreement with the obtained results. Main results: The secondary neutrons energy distributions present a continuous spectrum with two peaks, one centred on the thermal/epithermal region, and one on the high-energy region, with the most probable energy ranging from 19 MeV up to 240 MeV, depending on the ion type and its initial energy. The simulations show that the secondary neutron energies may exceed 400 MeV and, therefore, suitable neutron detectors for this energy range shall be needed. Additionally, the angular distribution of the low energy neutrons is quite isotropic, whereas the fast/relativistic neutrons are mainly scattered in the down-stream direction. Significance: It would be possible to minimize the influence of the heavy ions when measuring the neutron-generated recoil protons by selecting appropriate measurement positions within the phantom. Although there are discrepancies among the three Monte Carlo codes, the results agree qualitatively and in order of magnitude, being sufficient to support further investigations with the ultimate goal of mapping the secondary neutron doses both in- and out-of-field in hadrontherapy. The obtained secondary neutron spectra are available as supplementary material.

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confidence: 99%

Assessment of secondary neutrons in particle therapy by Monte Carlo simulations

et al. 2022

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“…These 'miniature' dosimeters were obtained by cutting the standard (6 × 6) cm 2 dosimeter into nine equal (2 × 2) cm 2 pieces, which fit into our etching cells and which can be placed in the required spots (figure 1). The standard electrochemical etching procedure from Universitat Autònoma de Barcelona, described by Bouassoule et al (1999), has been applied. Track density in the etched plates was measured using a semi-automatic counting system (Domingo et al 2009b).…”

Section: Padc-based Dosimetersmentioning

confidence: 99%

Estimation of neutron-equivalent dose in organs of patients undergoing radiotherapy by the use of a novel online digital detector

et al. 2012

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Neutron peripheral contamination in patients undergoing high-energy photon radiotherapy is considered as a risk factor for secondary cancer induction. Organ-specific neutron-equivalent dose estimation is therefore essential for a reasonable assessment of these associated risks. This work aimed to develop a method to estimate neutron-equivalent doses in multiple organs of radiotherapy patients. The method involved the convolution, at 16 reference points in an anthropomorphic phantom, of the normalized Monte Carlo neutron fluence energy spectra with the kerma and energy-dependent radiation weighting factor. This was then scaled with the total neutron fluence measured with passive detectors, at the same reference points, in order to obtain the equivalent doses in organs. The latter were correlated with the readings of a neutron digital detector located inside the treatment room during phantom irradiation. This digital detector, designed and developed by our group, integrates the thermal neutron fluence. The correlation model, applied to the digital detector readings during patient irradiation, enables the online estimation of neutron-equivalent doses in organs. The model takes into account the specific irradiation site, the field parameters (energy, field size, angle incidence, etc) and the installation (linac and bunker geometry). This method, which is suitable for routine clinical use, will help to systematically generate the dosimetric data essential for the improvement of current risk-estimation models.

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“…Comme cette dernière configuration n'était pas sensible aux neutrons thermiques, un nouveau convertisseur a été ajouté entre le Makrofol et le détecteur CR-39 (Bouassoule et al, 1999). Il s'agit d'un convertisseur de 3 mm d'air, qui convertit les neutrons thermiques en protons par l'intermédiaire de la réaction 14 N (n, p) 14 C. Cette configuration (PADC0) a été exposée dans différents points du bâtiment réacteur de la centrale nucléaire de Vandellòs II (Fernández et al, 2004a) durant une campagne de caractérisation des spectres de neutrons avec notre système de spectrométrie neutronique par sphères de Bonner.…”

Section: Le Détecteur De Traces Cr-39 : Son Optimisation Comme Détectunclassified

La dosimétrie et spectrométrie neutroniques : la contribution de l’université autonome de Barcelone

et al. 2006

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A Dosemeter Based on Nuclear Track Etched Detectors for Thermal, Fast and High Energy Neutrons with Flat Response

Cited by 12 publications

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Assessment of secondary neutrons in particle therapy by Monte Carlo simulations

Assessment of secondary neutrons in particle therapy by Monte Carlo simulations

Estimation of neutron-equivalent dose in organs of patients undergoing radiotherapy by the use of a novel online digital detector

La dosimétrie et spectrométrie neutroniques : la contribution de l’université autonome de Barcelone

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