Novel Gamma-Ray and Thermal-Neutron Scintillators: Search for High-Light-Yield and Fast-Response Materials

By M.D. Birowosuto and Muhammad Danang Birowosuto

In this book, bromide and iodide scintillators, which have been investigated for the past four years, are presented. Three major groups of compounds were studied; lanthanide trihalides LnX3, (pseudo)-elpasolites M2ALnX6 and ternary halides AmLnnXo. Where M and A are alkali cations, Ln is a rare earth cation and X is a halide anion. Some materials show interesting -scintillation properties. LuI3: Ce3+, one of lanthanide trihalides, has a record high light output of 98,000 photons/MeV and a fast response of 35 ns. Two other groups, (pseudo)-elpasolites and ternary halides, show relatively low light yields. For thermal neutron scintillator, the focus was on (pseudo)-elpasolites M2LiLnX6 and ternary halides LimLnnXo groups. Rb2LiYBr6: Ce3+ shows an excellent neutron peak resolution of 3.6 %. This is the best neutron peak resolution ever reported. Together with the large / ratio of 0.74, Rb2LiYBr6: Ce3+ offers the possibility of excellent neutron/ discrimination. The highest thermal neutron scintillation light yield of 83,000 photons/neutron is also reported for Rb2LiYBr6: Ce3+. The analysis for all halide scintillators is also presented. Limitation in their light yields and response times is discussed.

• Format: Paperback
• Language: English
• ISBN: 1586038168
• ISBN13: 9781586038168
• Release Date: May 2025
• Publisher: IOS Press
• Length: 218 Pages
• Weight: 0.78 lbs.
• Dimensions: 0.5" x 6.7" x 9.6"