Concentrational dependence of radiation-optical effects in ruby

Bessonova, T. S.; Stanislavskii, M. P.; Sobko, A. I.; Khaimov-Mal'kov, V.Ya.

doi:10.1007/bf00609484

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…The fluorescence decay times of the 2 E → 4 A 2 transitions are on the order of 1 ms or 10 ms, depending on the Cr 3+ doping concentration and ambient temperature (Powell and DiBartolo 1972, Bessonova et al 1977). Using external beam radiotherapy sources, Jordan (Jordan 1996) measured a ~3 ms half-time, and Teichmann et al (Teichmann et al 2013) measured 2 half-times of 2.54 ±0.03 ms and 46.6 ±0.6 ms.…”

Section: Discussionmentioning

confidence: 99%

“…Measurements by Bessonova et al (Bessonova et al 1977) showed that the radioluminescence could vary up to a factor of ~3 depending on the Cr 3+ ion concentration. Ruby crystals with optimized concentration of Cr 3+ may therefore enhance the signal strength.…”

Section: Discussionmentioning

confidence: 99%

“…It will also be potentially important to characterize the temperature dependence for each individual ruby crystal, since the rate of radioluminescence variation with temperature depends on the Cr 3+ ion concentration (Bessonova et al 1977). …”

Section: Discussionmentioning

confidence: 99%

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Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2016

Phys. Med. Biol.

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We tested the potential of ruby inorganic scintillation detectors (ISDs) for use in brachytherapy and investigated various unwanted luminescence properties that may compromise their accuracy. The ISDs were composed of a ruby crystal coupled to a poly(methyl methacrylate) fiber-optic cable and a charge-coupled device camera. The ISD also included a long-pass filter that was sandwiched between the ruby crystal and the fiber-optic cable. The long-pass filter prevented the Cerenkov and fluorescence background light (stem signal) induced in the fiber-optic cable from striking the ruby crystal, which generates unwanted photoluminescence rather than the desired radioluminescence. The relative contributions of the radioluminescence signal and the stem signal were quantified by exposing the ruby detectors to a high-dose-rate brachytherapy source. The photoluminescence signal was quantified by irradiating the fiber-optic cable with the detector volume shielded. Other experiments addressed time-dependent luminescence properties and compared the ISDs to commonly used organic scintillator detectors (BCF-12, BCF-60). When the brachytherapy source dwelled 0.5 cm away from the fiber-optic cable, the unwanted photoluminescence was reduced from > 5% to < 1% of the total signal as long as the ISD incorporated the long-pass filter. The stem signal was suppressed with a band-pass filter and was < 3% as long as the source distance from the scintillator was < 7 cm. Some ruby crystals exhibited time-dependent luminescence properties that altered the ruby signal by > 5% within 10 s from the onset of irradiation and after the source had retracted. The ruby-based ISDs generated signals of up to 20 times that of BCF-12-based detectors. The study presents solutions to unwanted luminescence properties of ruby-based ISDs for high-dose-rate brachytherapy. An optic filter should be sandwiched between the ruby crystal and the fiber-optic cable to suppress the photoluminescence. Furthermore, we recommend avoiding ruby crystals that exhibit significant time-dependent luminescence.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Ruby-based inorganic scintillation detectors for¹⁹²Ir brachytherapy

Kertzscher

Beddar

2016

Phys. Med. Biol.

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“…The curves become more structurized; two maxima at 130 and 160°C and two features in the shape of shoulders at 80 and 200°C are observed on them. It is important to note that sim ilar TL curves are observed in the α Al 2 O 3 crystals with transition metal impurities [73][74][75][76]. The TL yield decreases with a factor of 15 with increasing Fe impu rity concentration from 1 to 5% and in comparison with undoped A NC coatings with a factor of 50-75.…”

Section: Introductionmentioning

confidence: 99%

“…Such a decrease in the TL response during the intro duction of the low activity Fe impurity is not anoma lous. The doping of α Al 2 O 3 single crystals with tran sition metals, particularly in such high concentrations, may lead to the complete suppression of luminescent activity [74].…”

Section: Introductionmentioning

confidence: 99%