Determination of the internal pair production branching ratio of 90Y

Appl Radiat Isot. 2020 Feb:156:108943. doi: 10.1016/j.apradiso.2019.108943. Epub 2019 Oct 15.

Abstract

The National Institute of Standards and Technology (NIST) measured the internal pair production branching ratio of 90Y using two sources and four high purity germanium (HPGe) detectors to detect the resulting annihilation radiation. The internal pair production branching ratio determined from these measurements, (32.0 ± 1.5) × 10-6 (k = 1), agrees within 1 standard uncertainty with the recommended value of (32.6 ± 0.7) × 10-6 (k = 1) from the DDEP database.

Keywords: High purity germanium detector; Internal pair production; Quantitative PET imaging; Y-90.