Fiber-read radiation monitoring system using an optical fiber and red-emitting scintillator for ultra-high-dose conditions

Abstract

We have developed a remote scintillation detector using a CCD spectrometer and a red-emitting scintillator coupled with a 20 m optical fiber for ultra-high-dose conditions. Gamma rays were detected with a conventional deep-red-emitting ruby scintillator and Cs2HfI6, which is a novel material with 700 nm red emission and a high light output. The scintillators were irradiated with gamma rays from a 60Co source under an effective dose rate from ∼0.002 to ∼1 kSv h−1. The integrated area of the Cs2HfI6 emission spectra was larger than that of the ruby, and good linearity of the Cs2HfI6 signal as a function of dose rate was confirmed.

Crystal growth and scintillation properties of tube shape-controlled Ce-doped Y3Al5O12 single crystals grown by micro-pulling-down method

“…1) Scintillators have also been used for imaging in nuclear medicine, especially for positron emission tomography 2,3) and many other studies that are being actively carried out. 4,5) Recently, imaging methods where a scintillator array serves as a collimator have been developed. 6,7) Simultaneous radiation detection with a wide range of energy could be achieved, which was a significant challenge for such imaging methods.…”

Advanced Halide Scintillators: From the Bulk to Nano

“…[72,73,218] Moreover, improvement of material purification and crystal growth conditions [121,219,220] resulted in improvement of the ER down to 2.8% (at 662 keV 137 Cs). [219] Furthermore, analogs of Cs 2 HfCl 6 were investigated including A 2 MCl 6 , [221,222] Cs 2 HfBr x Cl 1Àx , [45,[223][224][225] A 2 HfI 6 , [226][227][228] Tl 2 MCl 6 , [199,[229][230][231][232] and Tl 2 HfBr 6 . [199] All exhibit broadband emission with scintillation decay times in the microsecond range.…”

“…Moreover, a redshift of the self-trapped exciton (STE) emission can be utilized to match the spectral sensitivity of the avalanche photodiode [120,226] or region of low-transmission losses of silica optical fibers. [228] However, bromide and iodide analogs of Cs 2 HfCl 6 suffer from high hygroscopicity. For a review of the Cs 2 HfCl 6 -type scintillators, see the study by Nagorny.…”

Scintillator‐oriented near‐infrared emitting Cs4SrI6:Yb2+, Sm2+ single crystals via sensitization strategy

“…[15][16][17][18][19] In case of bulk materials, the low light loss in optical fibers makes NIR emitting scintillators particularly suitable for long-distance radiation dose monitoring in extreme environments like nuclear reactors and nuclear ruins. [20][21][22][23][24] In medical dosimetry, scintillation probes connected by optical fibers are deployed nowadays. 25 Importantly, Cherenkov radiation, produced in optical fiber mostly in UV and blue region, increases the detection system response in badly defined way and complicates evaluation in case of UV/VIS emitting scintillators.…”

“…In the form of nanosized probes, they can be used for X‐ray induced in vivo imaging, since NIR photons emitted by the scintillator are not much absorbed in soft tissue so that scintillation light can be collected from bigger depth of the body 15–19 . In case of bulk materials, the low light loss in optical fibers makes NIR emitting scintillators particularly suitable for long‐distance radiation dose monitoring in extreme environments like nuclear reactors and nuclear ruins 20–24 . In medical dosimetry, scintillation probes connected by optical fibers are deployed nowadays 25 .…”