Testing and linearity calibration of films of phenol compounds exposed to thermal neutron field for EPR dosimetry

Gallo, Salvatore; Panzeca, S.; Longo, A.; Altieri, S.; Bentivoglio, Anna Rita; Dondi, Daniele; Marconi, Roberto; Protti, Nicoletta; Zeffiro, Alberto; Marrale, Maurizio

doi:10.1016/j.apradiso.2015.07.043

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…Irganox 1076 showing a linear response to low doses, was in the past considered as a dosimeter for clinical applications, appropriate for various types of ionizing radiation. There were reports in the literature, that in the polymeric matrix it can form after irradiation one, stable radical observed by EPR spectroscopy [29][30][31]. However, as seen in Figure 1b, the signals of microcrystalline Irganox 1076 powder are more complex.…”

Section: Irganox 1076mentioning

confidence: 83%

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

Przybytniak¹,

Sadło²,

Walo³

2020

Express Polym. Lett.

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Silane cross-linked polyethylene (PE) modified with two antioxidants (Irganox 1076 and Irganox PS802) and aluminum hydroxide (ATH) as a flame retardant, was irradiated with gamma rays at 77 K. The radical processes initiated by radiation were investigated by Electron Paramagnetic Resonance (EPR) spectroscopy from 100 K to the temperatures at which the spectra disappeared. Interpretation of the experimental signals was proposed. The mechanism of the two-stage action of phenolic antioxidant on PE was suggested on the basis of EPR spectra of individual components. It was found that paramagnetic defects generated by radiation in ATH decayed in parallel and independently of radical processes in PE matrix due to phase separation. Thus, in contrast to antioxidants, they did not affect the degradation of the PE matrix. The decrease in concentration of ATH defects in the range of 100-190 K was more efficient in the dispersed phase of the polymer composite than in the microcrystalline ATH powder.

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Section: Irganox 1076mentioning

confidence: 83%

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

Przybytniak¹,

Sadło²,

Walo³

2020

Express Polym. Lett.

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“…Nowadays, electron paramagnetic resonance (EPR) dosimetry is widely employed for radiation measurements with several compounds such as ammonium tartrate [1][2][3][4][5], lithium formate [6], dithionates, [7], phenolic compounds [8][9][10][11][12] and sugar [13,14] and others [15][16][17][18][19]. However, crystalline L-α-alanine is the most adopted material and is formally accepted as a secondary standard for high-dose measurements (kGy) and transfer dosimetry [20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Alanine films for EPR dosimetry of low-energy (1–30 keV) X-ray photons

D'Oca

Marrale

Abbene

et al. 2019

Nuclear Instruments and Methods in Physics Research Section B:

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L-α-alanine has aroused considerable interest for use in radiation EPR dosimetry and has been formally accepted as a secondary standard for high-dose (kGy) and transfer dosimetry of high-energy photons and electrons. In this work, we extended the investigation of the energy response of alanine EPR films in the low energy range for X-photons (1-30 keV). Electron Paramagnetic Spin Resonance (EPR) measurements were performed on Kodak BioMax alanine films exposed to low-energy X-rays from a Cu-, Wand Mo-targets tube operating at voltages up to 30 kV. Films were chosen because of the low penetration of the soft X-rays used. The response of alanine to low-energy X-rays was characterized experimentally and the relative response (with respect to high energy photons) was found to be between 0.8 and 0.9 for Cu-and Wtube X-rays, and 1.0 for Mo-tube X-rays. The attenuation profiles were investigated and it was found that 1 mm of film material reduces the intensity of the X-ray-beam by about 70%, 50% and 40% for Cu-, Wand Mo-tube X-rays, respectively. Monte Carlo simulations were performed to model the energy release as well as the depth dose profiles for the various radiation beams used. These data are considered relevant

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“…Dose determination based on measurements of free radicals, produced in suitable materials by ionizing radiation, has generally been known as a reliable and desirable dosimetric method [8][9][10][11]. Materials such as alanine [12,13], ammonium tartrate [14], clear fused quartz (CFQ) [15,16], phenol compounds [17,18] have been employed for such dose measurements in gamma and electron fields using electron spin resonance (ESR) technique. The most appropriate ones have low cross section for neutron interactions, but compounds containing high thermal neutron capture cross section nuclei are added to enhance their neutron sensitivity for measurements in a mixed n-γ field.…”

Section: Introductionmentioning

confidence: 99%

A preliminary optimization of alanine blends for ESR dosimetry in a mixedn–γ field: Monte Carlo simulation

Hoseininaveh¹,

Ranjbar²

2016

J. Inst.

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In this study, a preliminary work on the enhancement of ESR response of several arrangements of alanine and boron compounds, exposed to a thermal neutron beam, is presented using FLUKA code. A multi-layer dosimeter consist of consecutive layers of alanine and boron compounds showed that the amount of energy deposited in the alanine layers is maximized when their thickness is 5 μm and the thickness of boron compound layers are between 2 and 3 μm. Furthermore, the optimum number of 10B layers in the dosimeter was found to be 35 layers. Moreover, the alanine samples consisting of small spherical grains of boron compounds, arranged regularly in the middle plane of the dosimeters, exposed to a thermal neutron beam, were modeled. The dependence of energy deposition in the alanine material on the size of grains, and on their composition were also studied, as well.

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Testing and linearity calibration of films of phenol compounds exposed to thermal neutron field for EPR dosimetry

Cited by 14 publications

References 27 publications

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

Alanine films for EPR dosimetry of low-energy (1–30 keV) X-ray photons

A preliminary optimization of alanine blends for ESR dosimetry in a mixedn–γ field: Monte Carlo simulation

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Testing and linearity calibration of films of phenol compounds exposed to thermal neutron field for EPR dosimetry

Cited by 14 publications

References 27 publications

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

EPR studies on the interaction between additives and polyethylene matrix initiated by gamma radiation

Alanine films for EPR dosimetry of low-energy (1–30 keV) X-ray photons

A preliminary optimization of alanine blends for ESR dosimetry in a mixedn–γ field: Monte Carlo simulation

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Product

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Alanine films for EPR dosimetry of low-energy (1–30 keV) X-ray photons