| 1. |
- Klamra, Wlodzimierz, et al.
(författare)
-
Extensive studies on light yield non-proportional response of undoped CeF3 at room and liquid nitrogen temperatures
- 2013
-
Ingår i: Journal of Instrumentation. - 1748-0221. ; 8:6, s. P06003-
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper properties of various undoped CeF3 scintillators were investigated at room and liquid nitrogen (LN2) temperatures. The study was focused on measurements of radioluminescence spectra, decay time, non-proportional response to X-and gamma-rays, energy and intrinsic resolution at different temperature environment. Surprisingly, all the tested pure CeF3 crystals show non-proportional response up to 5.1 MeV gamma ray energy, which is contrary to the typical nonproportionality observed below 100 keV for most of the inorganic scintillators. The investigation of the phenomenon occurring in CeF3 scintillators would be another step to get a better knowledge of the scintillators nature, which still has not been entirely understood.
|
|
| 2. |
- Klamra, Wlodzimierz, et al.
(författare)
-
Light yield nonproportionality of doped CeF3 scintillators
- 2014
-
Ingår i: Journal of Instrumentation. - 1748-0221. ; 9, s. P07013-
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper measurements of emission spectra, light output and nonproportional response of CeF3 scintillators doped with Ca, Sr, Ba and Pr were conducted. Results showed degradation of the light output for the doped samples in comparison with an undoped CeF3. For each scintillator the nonproportional response on gamma radiation showed unusual lack of saturation at 100 keV, as observed previously for undoped CeF3 samples.
|
|
| 3. |
- Klamra, Wlodzimierz, et al.
(författare)
-
Study of undoped CeF3 scintillators at room and liquid nitrogen temperature
- 2012
-
Ingår i: 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference record (NSS/MIC). - : IEEE. - 9781467320306 ; , s. 315-317
-
Konferensbidrag (refereegranskat)abstract
- In this paper properties of various undoped CeF3 scintillators were investigated at room and liquid nitrogen (LN2) temperature. The study was focused on measurements of radioluminescence spectra, decay time, non-proportional response on X- and γ-rays and energy resolution at different temperature environment. Surprisingly, the pure CeF3 crystals show comparable non-proportionality curves, which are very similar to that presented by inorganic scintillators. The investigation of the phenomenon occurring in CeF3 scintillators would be another step to get a better knowledge of the scintillators nature, which still haven't been entirely understood.
|
|
| 4. |
- Swiderski, L., et al.
(författare)
-
CsI:T1 Scintillation Pulse Shapes Measured with a SiPM Photodetector in a Liquid Nitrogen Cryostat
- 2016
-
Ingår i: 2016 IEEE NUCLEAR SCIENCE SYMPOSIUM, MEDICAL IMAGING CONFERENCE AND ROOM-TEMPERATURE SEMICONDUCTOR DETECTOR WORKSHOP (NSS/MIC/RTSD). - : IEEE. - 9781509016426
-
Konferensbidrag (refereegranskat)abstract
- A custom designed cryostat was constructed to measure the response of a CsI:T1 scintillator at temperatures close to the boiling point of liquid nitrogen (LN2). The scintillation light was collected by an HUV-HD SiPM from FBK with 6x6 mm(2) area and 25x25 mu m(2) cell pitch. The crystal size was 5x6x7 mm(3). All surfaces except the one facing the SiPM were covered with Teflon tape to enhance light collection by the photodetector. The performance of the experimental setup was verified at room temperature using analog electronics for signal processing. The crystal was mounted on a copper frame placed inside the LN2 cryostat. Since our goal was to measure the scintillation decay profiles, and the SiPM response at low temperatures becomes substantially slower than that observed at room temperature, the SiPM was mounted on a separate copper frame connected with the outer housing to keep it close to room temperature. The separation between the crystal surface and the SiPM was about 1.5 mm at room temperature, and it became smaller once the setup was cooled down to LN2 temperature, but even so the crystal and the photodetector were still separated. This approach allowed us to analyze scintillation pulse shapes of CsI:T1 at LN2 temperatures. An energy spectrum of 662 keV gamma-rays from a Cs-137 source was also recorded. The light yield of the CsI:T1 sample at LN2 temperature stands at about 6 % divided by 8 % of the value observed at room temperature.
|
|
| 5. |
- Swiderski, L., et al.
(författare)
-
CsLTl scintillation pulse shapes measured with a SiPM photodeteetor in a liquid nitrogen cryostat
- 2017
-
Ingår i: 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. - : Institute of Electrical and Electronics Engineers (IEEE).
-
Konferensbidrag (refereegranskat)abstract
- A custom designed cryostat was constructed to measure the response of a CsI:Tl scintillator at temperatures close to the boiling point of liquid nitrogen (LN 2 ). The scintillation light was collected by an HUV-HD SiPM from FBK with 6×6 mm 2 area and 25×25 μm 2 cell pitch. The crystal size was 5×6×7 mm 3 . All surfaces except the one facing the SiPM were covered with Teflon tape to enhance light collection by the photodetector. The performance of the experimental setup was verified at room temperature using analog electronics for signal processing. The crystal was mounted on a copper frame placed inside the LN 2 cryostat. Since our goal was to measure the scintillation decay profiles, and the SiPM response at low temperatures becomes substantially slower than that observed at room temperature, the SiPM was mounted on a separate copper frame connected with the outer housing to keep it close to room temperature. The separation between the crystal surface and the SiPM was about 1.5 mm at room temperature, and it became smaller once the setup was cooled down to LN 2 temperature, but even so the crystal and the photodetector were still separated. This approach allowed us to analyze scintillation pulse shapes of CsI:Tl at LN 2 temperatures. An energy spectrum of 662 keV γ-rays from a 137 Cs source was also recorded. The light yield of the CsI:Tl sample at LN 2 temperature stands at about 6 % ÷ 8 % of the value observed at room temperature.
|
|
