Assignments and optical properties of X-ray-induced colour centres in blue and orange radiophotoluminescent silver-activated glasses

Nuclear Instruments and Methods in Physics Research Section B:

Miyamoto²,

Maruyama

et al. 2014

We report novel disk-type X-ray two-dimensional (2-D) imaging detectors utilising Ag-doped phosphate glass and lithium fluoride (LiF) thin films based on the radiophotoluminescence (RPL) and photoluminescence (PL) phenomena, respectively. The accumulated X-ray doses written in the form of atomic-scale Ag-related luminescent centres in Ag-doped glass and F-aggregated centres in LiF thin films were rapidly reconstructed as a dose distribution using a homemade readout system. The 2-D images reconstructed from the RPL and PL detectors are compared with that from the optically stimulated luminescence (OSL) detector. In addition, the optical and dosimetric characteristics of LiF thin films are investigated and evaluated. The possibilities of dose distributions with a high spatial resolution on the order of microns over large areas, a wide dynamic range covering 11 orders of magnitude and a non-destructive readout are successfully demonstrated by combining the Ag-doped glass with LiF thin films. Toshio KUROBORI HIGHLIGHTSA novel disk-type Ag-doped glass and LiF thin film detectors based on the RPL and PL phenomena, respectively, were proposed.The capabilities of the 2-D dose images accumulated with a high spatial resolution and a wide dynamic range were demonstrated.The 2-D images reconstructed from the RPL and PL detectors were compared with that from the OSL detector. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Center, Chiyoda Technol Corporation, 3681 Narita-cho, Oarai-machi, Ibaraki 311-1313, Japan c Pulstec Industrial Corporation, 7000-35 Nakagawa, Hosoe-cho, Kita-ku, Hamamatsu-shi, Shizuoka, 431-1304 Research Highlights ABSTRACTWe report novel disk-type X-ray two-dimensional (2-D) imaging detectors utilising Ag-doped phosphate glass and lithium fluoride (LiF) thin films based on the radiophotoluminescence (RPL) and photoluminescence (PL) phenomena, respectively. The accumulated X-ray doses written in the form of atomic-scale Ag-related luminescent centres in Ag-doped glass and F-aggregated centres in LiF thin films were rapidly reconstructed as a dose distribution using a homemade readout system. The 2-D images reconstructed from the RPL and PL detectors are compared with that from the optically stimulated luminescence (OSL) detector. In addition, the optical and dosimetric characteristics of LiF thin films are investigated and evaluated. The possibilities of dose distributions with a high spatial resolution on the order of microns over large areas, a wide dynamic range covering 11 orders of magnitude and a non-destructive readout are successfully demonstrated by combining the Ag-doped glass with LiF thin films.

“…In addition, the origin, formation kinetics and optical properties of X-ray-induced Ag centres were also investigated through various methods [15,16].…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

A comparative study of optical and radiative characteristics of X-ray-induced luminescent defects in Ag-doped glass and LiF thin films and their applications in 2-D imaging

Nuclear Instruments and Methods in Physics Research Section B:

Miyamoto²,

Maruyama

et al. 2014

“…Recently, we have systematically investigated the assignments and optical properties of X-ray-induced silver-related species of PG:Ag by means of various optical measurements such as RPL decay curve analysis, peak fitting analysis and heat treatments (Kurobori et al, 2010;Zheng and Kurobori, 2011). It was established from these results that the decomposed six Gaussian bands induced by X-ray irradiation in PG:Ag were, in turn, attributed to Ag + , Ag 3 + or Ag 3 2+ , Ag 2 + , Ag 2+ , Ag 0 and hole-trap centres, respectively.…”

Section: Introductionmentioning

confidence: 99%

Formation and assignment of silver defect centres in phosphate glass induced by femtosecond laser pulses

Zheng

Miyamoto

et al. 2011

Radiation Measurements

We have investigated the formation and assignment of silver defect centres such as Ag 0 , Ag 2+ and other molecular silver species induced by femtosecond (fs) laser pulse irradiation. In particular, direct precipitation of silver nanoparticles without heat treatment was demonstrated to clarify the formation kinetics of silver defect centres in a radiophotoluminescent phosphate glass by 250 kHz high repetition rate fs laser pulses. Comparison using X-ray-and fs laser-irradiation methods is also presented.

“…In addition, the origin, formation kinetics and optical properties were also investigated with a peak-fitting analysis, a high-repetition-rate femtosecond (fs) laser technique, an RPL decay curve analysis, a heat treatment, and transmission electron microscopy (TEM) (Zheng and Kurobori, 2011a;Zheng et al, 2011;Zheng and Kurobori, 2011b).…”

Section: Resultsmentioning

confidence: 99%

A novel disk-type X-ray area imaging detector using radiophotoluminescence in silver-activated phosphate glass

Nakamura

2012

Radiation Measurements

Self Cite

We report a novel two-and three-dimensional (2-D, 3-D) imaging detector based on the radiophotoluminescence (RPL) phenomenon in silver-activated phosphate glass (PG:Ag) and evaluate its dosimetric characteristics. A compact disk-type PG:Ag detector with a diameter of 80 mm was rotated at a rate of 400 rpm to read out the accumulated dose information and then remove the images for reuse. After X-ray exposure, three RPL dosimeter processes, i.e., preheating, reading, and erasing, were carried out with only a UV laser at 375 nm by adjusting the stepwise output levels. The 3-D images and dose distributions were rapidly reconstructed with a high spatial resolution of 1 μm and a sensitivity of 1 mGy.