Comparative study for intermediate crystal size of NaI(Tl) scintillation detector

Area of Science:

• Nuclear Physics
• Experimental Physics
• Scintillation Detection

Background:

• Sodium Iodide (Thallium-activated) [NaI(Tl)] detectors are widely used in nuclear physics.
• Detector performance is influenced by various factors, including crystal size.
• Understanding these influences is crucial for optimizing experimental setups, particularly in Compton scattering.

Purpose of the Study:

• To experimentally investigate the impact of NaI(Tl) scintillation detector crystal size on key performance parameters.
• To provide insights for selecting appropriate crystal dimensions in Compton scattering experiments.
• To analyze the detector's response function and factors affecting peak broadening.

Main Methods:

• Experimental investigation of NaI(Tl) detector parameters: intrinsic efficiency, photo-peak efficiency, resolution, and response function.
• Analysis of detector response function as an inverse matrix.
• Discussion of factors influencing peak broadening (full energy and backscattered peaks).

Main Results:

• Detector resolution varies with incident gamma energy and crystal size.
• Statistical fluctuations in scintillation mechanism contribute to photo-peak broadening.
• Signal-to-noise ratio and photo-fraction are discussed for different crystal sizes, corrected for detector efficiency.

Conclusions:

• Crystal size is a critical factor influencing NaI(Tl) detector performance metrics like resolution and efficiency.
• The study enhances understanding for optimizing NaI(Tl) detector selection in Compton scattering experiments.
• Factors affecting the detector's response function and peak broadening are elucidated.