Positron annihilation lifetime spectroscopy is applied to BaSrFBr:Eu film which is used for the phosphore layer,and afterwards the reliability and self-consistency of source corrections in the positron lifetime spectroscopy is investigated usinga 22Na positron emitter covered by thin foils. The positron lifetime showed no significant change through the various protonirradiation energies. It is unusual that the measurements of the defects indicate that most of the defects were likely to have beengenerated by X-ray radiation. This may have resulted from the Bragg peaks of the proton characteristics. The Bragg peak doesnot affect the defect signals enough to distinguish the lifetimes and intensities in a material that is includes multi-grains. Thelifetime (τ1) associated with positron annihilations in the Ba, Br, and Eu of the sample was about 250ps, and due to theannihilations at F-centers or defects from the irradiated protons in sample, the lifetime (τ2) was about 500ps.

• 임유석 | Im, Yu-Suk
• 이종용 | 이종용