Actual and discussible issues of 21st century radiobiology

Yarmonenko, S.P.

doi:10.1504/ijlr.2008.020250

Cited by 3 publications

(3 citation statements)

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“…When they collide with nuclei they are either, absorbed by them or recoil from them. In elastic neutron scattering in substances containing a large number of hydrogen atoms, the energy of incident neutrons is halved on an average, being transferred partially to recoil protons [23,24]. Then, the damage of EPDM promoted by neutron irradiation can be considered as the main effect.…”

Section: Resultsmentioning

confidence: 99%

Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering

et al. 2018

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The changes in the degree of crystallinity in commercial Ethylene Propylene Diene rubber-type M (EPDM) irradiated with neutrons at different doses has been studied by means of inelastic neutron scattering and infrared absorption spectroscopy experiments. EPDM samples were taken from the housing of non-ceramic electrical insulators which are used in outdoor transmission lines of 66 kV. Inelastic neutron scattering spectra were recorded at 5 K with an accessible energy-transfer range between 180 -3500 cm -1 . Infrared studies were performed at room temperature with an energy transfer between 4000 -400 cm -1 . Controlled neutron irradiation allows to obtain different volume fraction and size of crystalline zones in EPDM. The obtained results are discussed and correlated with studies of differential scanning calorimetry, dynamic mechanical analysis and positron annihilation lifetime spectroscopy from where the changes in crystallinity in EPDM were indirectly studied. Inelastic neutron scattering studies were not appropriate for determining the changes in the crystallinity degree in neutron irradiated commercial EPDM. In contrast, from infrared absorption spectroscopy the changes in crystallinity could be determined successfully.

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Section: Resultsmentioning

confidence: 99%

Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering

et al. 2018

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“…When they collide with nuclei they are either, absorbed by them or recoil from them. In elastic neutron scattering in substances containing a large number of hydrogen atoms, the energy of incident neutrons is halved on an average, being transferred partially to recoil protons [18,19]. Then, a more homogeneous distribution into the matrix of the chemicrystallization process should be obtained.…”

Section: Neutron Irradiationmentioning

confidence: 99%

Study of dielectric strength in EPDM by nondestructive dynamic mechanical analysis in high electrical field

Bonifacich

Giordano

Lambri

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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In the present work the value of the degree of the area swept by the polymer chain due to an electrical force for a given mesostructure was related to the corresponding value of the dielectric strength. This value was deduced from the electric inclusion formalism applied to dynamic mechanical analysis (DMA) studies conducted under high electric field, which were performed in commercial ethylene-propylene-diene M-class rubber (EPDM); used for the housing of polymeric electrical insulators. EPDM samples with different arrangements of the polymer chains and crystalline degree, promoted by controlled neutron irradiation were studied. Several characterization techniques, as infrared absorption spectroscopy (IR), differential scanning calorimetry (DSC), positron annihilation lifetime spectroscopy (PALS) and dielectric strength (DS) were also used. The relationship between the DS and the degree of movement of polymer chains promoted by electrical forces coming from the electric field applied in a non destructive test as the DMA was successfully established. In fact, a larger empty space in the sample leads to larger areas swept by the polymer chains during bending under the application of the field strength in the dynamic mechanical analysis tests. Therefore, an increase in the capability of movement of charges occurs, corresponding to smaller dielectric strength values. Crystallinity improves the dielectric strength due to the increase in the internal stresses which decreases the capability of movement of the polymer chains and electric carriers by electric forces.

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“…The loss of this ability as a function of radiation dose is described by the dose-survival curve. A cell survival curve describes the relationship between the radiation absorbed dose and the proportion of cells that survive (or surviving fraction) [3,4]. For a tumor to be eradicated in a single fraction in radiotherapy, it is only necessary that cells be killed in the sense that they are rendered unable to divide and cause further growth and spread of the malignancy [3].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Different Single Doses from X-Rays on Pediatrics Rhabdomyosarcoma Tumor Cells: In Vitro Survival Curve

Osman¹

2016

CTOIJ

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Actual and discussible issues of 21st century radiobiology

Cited by 3 publications

References 0 publications

Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering

Changes in the crystalline degree in neutron irradiated EPDM viewed through infrared spectroscopy and inelastic neutron scattering

Study of dielectric strength in EPDM by nondestructive dynamic mechanical analysis in high electrical field

The Effect of Different Single Doses from X-Rays on Pediatrics Rhabdomyosarcoma Tumor Cells: In Vitro Survival Curve

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