摘要: Positronium fraction measurements using positron beams have been utilized to extract information about the diffusion properties of positrons as well as defect concentrations in the near surface region of materials under a variety ... 展开 Positronium fraction measurements using positron beams have been utilized to extract information about the diffusion properties of positrons as well as defect concentrations in the near surface region of materials under a variety of experimental conditions. Owing to this recent interest we have undertaken to study some of the systematics and uncertainties associated with measurements of the positronium fraction, f. We restrict our discussion to determinations of f based on the peak:total ratio of counting rates for a single detector, only briefly considering alternate ways of obtaining f. We conclude with several recommendations that should be of particular interest to practitioners in the field. (ERA citation 10:014899) 收起