Supervisor: Prof. Bruce Mellado

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Presentation transcript:

Supervisor: Prof. Bruce Mellado A Comparative study of the radiation hardness of plastic scintillators for the upgrade of the tile calorimeter of the atlas detector Shell-may Liao Supervisor: Prof. Bruce Mellado Thanks to: B. Mellado, E. Haddad, H. Jivan, C. Pelwan, G. Peters, iThemba LABS Gauteng team

outline Introduction Scintillation mechanism SRIM and TRIM simulations Sample preparation Radiation process Transmission spectroscopy Results and analysis Conclusion

Introduction Main problem encountered by scintillators Scintillators exhibit luminescence when excited by ionizing radiation PVT based scintillators: EJ 200, EJ 208, EJ 260 Experimental procedure sample dimensions: 500μm x 500μm x 350 μm

Scintillation mechanism Common feature in plastic scintillator = benzene ring Delocalized electrons are prone to excitation Electronic levels of a PVT molecule PVT base is doped with flours Fluors absorb the base scintillation and emit at longer wavelengths

srim simulations About SRIM Stopping Range of 6MeV protons in PVT Stopping range = 474.17 μm

trim simulations Transport of 6MeV protons in PVT Average energy of transmitted protons = 2.8MeV Thus energy lost by 6MeV protons = 3.2MeV

Sample preparation Employed metallographic techniques: Documentation 20 cm x 2 cm x 1cm Sectioning and cutting Mounting Rough Polishing Final polishing Polished samples range: 300 μm – 380 μm

Radiation process Tandem accelerator of iThemba LABS Gauteng Exposure doses: 80 MGy 25 MGy 8 MGy 0.8 MGy

Radiation process

Transmission spectroscopy Why transmission spectroscopy? Dual beam spectrometer Spectra recorded as percentage of light transmission through air

Transmission spectroscopy

Unirradiated transmission data EJ 200 – 85.7% EJ 208 – 83.2% EJ 260 – 80.8%

EJ 208 & EJ 260 Transmission plots

Transmission data

EJ 208 transmission plot (Annealing ID)

EJ 200 transmission plot (Annealing ID)

conclusion Radiation exposure = decrease in light transmission in all grades Increase in dose = decrease in transmission Samples undergo annealing Possible formation of free radicals (EPR) Raman and light yield studies were done by Ms. Harshna Jivan EJ 208 exhibits the best light transmission properties Lowest decrease in % transmission for most doses Large amount of healing in short period of time.

According to Markley et al, “A radiation hard plastic scintillator can be defined as a scintillator that does not exhibit a large decrease in light yield output when exposed to ionizing radiation and which can recover a substantial amount of its light output in a short time after being irradiated”.