Optical properties and valence state of Sm ions in aluminoborosilicate glass under β-irradiation

β-irradiation effect in aluminoborosilicate glasses: The role of RE codoping (RE = Sm, Gd)

“…Recently, we have shown that structural modifications in aluminoborosilicate glasses doped with rare-earth ions under irradiation are correlated with the content and nature of the RE dopant [2][3][4]. According to [2][3][4], the weakening of some structural changes induced by ionizing radiation (more specifically, sodium migration, Raman shift of the Si-O-Si bending vibration mode, and point defect creation) can be linked to the relative stability of the different redox states of the RE ion. As follows from the results presented, doubly and singly doped aluminoborosilicate glasses containing Sm, Ce, and/or Gd and Nd reveal completely different behavior under irradiation; a feature evidenced both by EPR and Raman spectroscopy.…”

“…Two glass materials were fabricated with total concentrations of a [2][3][4]. All samples were irradiated with 2.5-MeV electrons generated by a Van de Graaff accelerator.…”

“…For this purpose, simplified borosilicate glasses doped with rare-earth (RE) ions as models of the actinides are irradiated with electrons to simulate the consequences of β decay [1]. Our previous studies of singly RE-doped aluminoborosilicate glasses showed that ionizing radiation gives rise to RE 3+ reduction and modifications in the glass structure [2][3][4]. This has motivated our emphasis on the investigation of the interplay between structural evolution and reduction in aluminoborosilicate glasses subjected to irradiation in the hope of revealing a general trend in the behavior of singly RE-doped glasses.…”

Spatially resolved measurement of high doses in microbeam radiation therapy using samarium doped fluorophosphate glasses

“…4 Various papers have demonstrated the possibility of valence conversion of different rare earth ions in a variety of host materials under different forms of excitation such as x-rays, c-, and b-irradiation as well as near-infrared (NIR) optical excitation. [5][6][7][8][9][10] Among the rare earth ions, Sm 3þ to Sm 2þ conversion is of particular interest because the dominant emission bands of Sm 3þ and Sm 2þ ions are very easy to distinguish, all dominant bands are situated in a red region of the spectrum and make a good match to silicon based detectors used in optical measurement. It should be stressed immediately that Sm 3þ !…”

“…Sm 2þ conversion may provide submicron spatial resolution with respect to optical storage of information as was recently demonstrated. 7,8 We present data on Sm-doped fluorophosphate (FP) glasses as a potential dosimeter material to measure both the dose and the peak-to-valley dose ratio (PVDR), a critical parameter for efficient MRT therapy. We demonstrate the efficiency of Sm 3þ !…”