Role of intermediate species in the formation of ion tracks in PADC: A review

Fromm, M.; Kodaira, Satoshi; Kusumoto, Tetsuya; Barillon, Rémi; Yamauchi, Tomoya

doi:10.1016/j.polymdegradstab.2019.01.028

Cited by 26 publications

(14 citation statements)

References 107 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reactions with OH groups fix the breaks and prevent recoupling. Response of CR‐39 to irradiation is found elsewhere . A chemical etchant erodes the radiation‐damaged region more rapidly than the undamaged region.…”

Section: Methodsmentioning

confidence: 91%

See 1 more Smart Citation

Estimations of relative biological effectiveness of secondary fragments in carbon ion irradiation of water using CR‐39 plastic detector and microdosimetric kinetic model

et al. 2019

Self Cite

View full text Add to dashboard Cite

Purpose To estimate relative biological effectiveness (RBE) ascribed to secondary fragments in a lateral distribution of carbon ion irradiation. The RBE was estimated with the microdosimetric kinetic (MK) model and measured linear energy transfer (LET) obtained with CR‐39 plastic detectors. Methods A water phantom was irradiated by a 12C pencil beam with energy of 380 MeV/u at the Gunma University Heavy Ion Medical Center (GHMC), and CR‐39 detectors were exposed to secondary fragments. Because CR‐39 was insensitive to low LET, we conducted Monte Carlo simulations with Geant4 to calculate low LET particles. The spectra of low LET particles were combined with experimental spectra to calculate RBE. To estimate accuracy of RBE, we calculated RBE by changing yield of low LET particles by ± 10% and ± 40%. Results At a small angle, maximum RBE by secondary fragments was 1.3 for 10% survival fractions. RBE values of fragments gradually decreased as the angle became larger. The shape of the LET spectra in the simulation reproduced the experimental spectra, but there was a discrepancy between the simulation and experiment for the relative yield of fragments. When the yield of low LET particles was changed by ± 40%, the change in RBE was smaller than 10%. Conclusions An RBE of 1.3 was expected for secondary fragments emitted at a small angle. Although, we observed a discrepancy in the relative yield of secondary fragments between simulation and experiment, precision of RBE was not so sensitive to the yield of low LET particles.

show abstract

Section: Methodsmentioning

confidence: 91%

“…Response of CR-39 to irradiation is found elsewhere. [25][26][27] A chemical etchant erodes the radiation-damaged region more rapidly than the undamaged region. The former and latter erosion rates are known as the track etch rate (V t ) and bulk etch rate (V b ), respectively.…”

Section: A Cr-39 Plastic Charged Particle Detectorsmentioning

confidence: 99%

Estimations of relative biological effectiveness of secondary fragments in carbon ion irradiation of water using CR‐39 plastic detector and microdosimetric kinetic model

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Provided with this framework, the contribution focuses on (1) the experimental and (2) the practical aspects of a decade of research, and (3) a discussion of the forthcoming issues and the directions we foresee research on latent tracks in PADC could take, for other research group can continue and reproduce this research. To complement the present study from the viewpoint of radiation chemistry in PADC, the reader is referred to the recent review by Fromm et al [ 43 ].…”

Section: Introductionmentioning

confidence: 99%

Methodological and Conceptual Progresses in Studies on the Latent Tracks in PADC

2021

Self Cite

View full text Add to dashboard Cite

Modified structure along latent tracks and track formation process have been investigated in poly (allyl diglycol carbonate), PADC, which is well recognized as a sensitive etched track detector. This knowledge is essential to develop novel detectors with improved track registration property. The track structures of protons and heavy ions (He, C, Ne, Ar, Fe, Kr and Xe) have been examined by means of FT-IR spectrometry, covering the stopping power region between 1.2 to 12,000 eV/nm. Through a set of experiments on low-LET radiations—such as gamma ray-, multi-step damage process by electron hits was confirmed in the radiation-sensitive parts of the PADC repeat-unit. From this result, we unveiled for the first-time the layered structure in tracks, in relation with the number of secondary electrons. We also proved that the etch pit was formed when at least two repeat-units were destroyed along the track radial direction. To evaluate the number of secondary electrons around the tracks, a series of numerical simulations were performed with Geant4-DNA. Therefore, we are proposing new physical criterions to describe the detection thresholds. Furthermore, we propose a present issue of the definition of detection threshold for semi-relativistic C ions. Additionally, as a possible chemical criterion, formation density of hydroxyl group is suggested to express the response of PADC.

show abstract

“…In order to describe molecular and chemical damages formed in PADC and other particle track detector (PTD) polymers by ionizing radiations; an international collaboration that aimed at studying radiation damage using spectroscopic measurements has been set up between Japan and France (T. Yamauchi, T. Kusumoto, R. Barillon, and their co-workers) (Barillon and Yamauchi, 2003;Yamauchi et al, 2005a,;Yamauchi et al, 2008a,b;Mori et al, 2009;Yamauchi, 2012;Mori et al, 2011;Mori et al, 2013;Barillon et al, 2013;Kusumoto et al, 2015;Kusumoto et al, 2016;Yamauchi et al, 2018). This team was able to highlight which are the chemical units of the PADC structure that are involved in the destructive process at the origin of ionizing radiation damage trails as mentioned in a recent review paper (Fromm et al, 2019). That vast study is based on analyses of spectroscopic J o u r n a l P r e -p r o o f 3 experimental data of the loss/appearance of specific chemical functions further to PADC/PTD polymer exposure to various ionizing radiations such as alpha particles, gamma rays and heavy ions.…”

Section: Introductionmentioning

confidence: 99%

Loss of chemical bonds induced by high doses of γ-radiation in a PADC polymer film: The influence of dose and dose rate on radiation chemical yields

Saad

Fromm²,

Ibraheim³

et al. 2021

Radiation Physics and Chemistry

View full text Add to dashboard Cite

Role of intermediate species in the formation of ion tracks in PADC: A review

Cited by 26 publications

References 107 publications

Estimations of relative biological effectiveness of secondary fragments in carbon ion irradiation of water using CR‐39 plastic detector and microdosimetric kinetic model

Estimations of relative biological effectiveness of secondary fragments in carbon ion irradiation of water using CR‐39 plastic detector and microdosimetric kinetic model

Methodological and Conceptual Progresses in Studies on the Latent Tracks in PADC

Loss of chemical bonds induced by high doses of γ-radiation in a PADC polymer film: The influence of dose and dose rate on radiation chemical yields

Contact Info

Product

Resources

About