Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures

Kusumoto, Tetsuya; Okada, S.; Kurashige, H.; Kobayashi, Kazuo; Fromm, M.; Raffy, Quentin; Ludwig, Nicolas; Kanasaki, Masato; Oda, Keiji; Honda, Yoshihide; Tojo, Sachiko; Groetz, Jean-Emmanuel; Ogawara, Ryo; Kodaira, Satoshi; Barillon, Rémi; Yamauchi, Tomoya

doi:10.1016/j.radphyschem.2019.108628

Cited by 9 publications

(9 citation statements)

References 60 publications

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“…Following on these experiments we developed a thinning process of PADC films to reduce the thickness to less than 3 µm, with a precise and accurate estimation of their thickness [16]. Thanks to this new material, off-line measurements of protons and heavy ions (He, C, Ne, Ar, Fe, Kr and Xe) were made, covering the stopping powers ranging from 1.2 to 12,000 eV/nm [15][16][17][18][19][20][21][22][23], as well as low-LET radiations [20,21,[24][25][26]. As a reference, effects on exposure to ultraviolet (UV) photons with a wavelength of 222 nm were also executed [27].…”

Section: One Decade Of Methodological and Conceptual Evolutionmentioning

confidence: 99%

“…And in the central region, parts of polyethylene-like structure are also modified. Through the experiments using low-LET radiations of 28 MeV electron beams [25], gamma rays from 60 Co and 1.5 keV ultra-soft X ray [26], it was found that a single electron can cleave ether but it cannot break the carbonate ester. Carbonate ester turns out to be radiation-sensitive when the adjacent ether is lost.…”

Section: One Decade Of Methodological and Conceptual Evolutionmentioning

confidence: 99%

“…In our early studies on the effects of gamma rays from 60 Co, we obtained G value of 20 scissions/100 eV for the loss of carbonate ester [24]. In the later, this was modified as that the value was valid above the critical dose of about 60 kGy [26]. Through the FT-IR studies on the effects of 28 MeV electron beams on PADC, applying the track overlapping model [42,[50][51][52], it was found that the carbonate ester was radiation-sensitive after the damage of the ether in the same repeat-unit [25].…”

Section: Critical Dose For Loss Of Carbonate Estermentioning

confidence: 99%

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

Yamauchi¹,

Kanasaki²,

Barillon³

2021

Preprint

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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 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 tracks, a series of numerical simulations were performed with Geant4-DNA. Therefore, we are proposing new physical criterions to describe the detection thresholds. Futhermore, we propose a present issue of the definition of detection threshold for semi-relativistic C ions. And as a possible chemical criterion, formation density of hydroxyl group is suggested to express the response of PADC.

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Section: One Decade Of Methodological and Conceptual Evolutionmentioning

confidence: 99%

Section: One Decade Of Methodological and Conceptual Evolutionmentioning

confidence: 99%

Section: Critical Dose For Loss Of Carbonate Estermentioning

confidence: 99%

See 1 more Smart Citation

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

Yamauchi¹,

Kanasaki²,

Barillon³

2021

Preprint

Self Cite

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show abstract

“…Following on these experiments we developed a thinning process of PADC films to reduce the thickness to less than 3 µm, with a precise and accurate estimation of their thickness [ 15 ]. Thanks to this new material, off-line measurements of protons and heavy ions (He, C, Ne, Ar, Fe, Kr and Xe) were made, covering the stopping powers ranging from 1.2 to 12,000 eV/nm [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], as well as low- LET radiations [ 20 , 21 , 24 , 25 , 26 ]. As a reference, effects on exposure to ultraviolet (UV) photons with a wavelength of 222 nm were also executed [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the central region, parts of the polyethylene-like structure are also modified. Through the experiments using low- LET radiations of 28 MeV electron beams [ 25 ], gamma rays from 60 Co and 1.5 keV ultra-soft X ray [ 26 ], it was found that a single electron can cleave the ether, but it cannot break the carbonate ester. Carbonate ester turns out to be radiation-sensitive when the adjacent ether is lost.…”

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.

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Microscopic Mechanisms of Damage Caused by Degradants

Wypych¹

2022

Atlas of Material Damage

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Evidence for a critical dose above which damage to carbonate ester bonds in PADC appear after gamma ray and ultra soft X-ray exposures

Cited by 9 publications

References 60 publications

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

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

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

Microscopic Mechanisms of Damage Caused by Degradants

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