第二届地理测年技术学术研讨会（2021）

2 / 2021-09-07 20:28:42

一种提高BeO离子束流的方法

加速器，Be+2测量，Be-10年代

Higher Beam currents are expected during ¹⁰Be/⁹Be measurements by  accelerated mass spectrometry. The last two steps for Be sample preparation include the burning of Be(OH)₂ to obtain BeO and then niobium power is added and mixed with the BeO to increase ion beam current. However, the burnt BeO is flaky and a little bit hard to be ground to power so that they cannot mixed evenly. In this study, we present a method of sample preparation which would increase beam current for Be measurement so as to decrease the measurement errors. After Be(OH)₂ gel was prepared, we added a little bit niobium powder into the gel and mixed them evenly. After burning in a muffle furnace, Niobium was oxidized into Nb₂O₅, and Be(OH)₂ was dehydrated into BeO. They eventually became a fluffy, evenly white powder. Finally a little bit niobium was added into the white powder. The results of ¹⁰Be measurements show that the average of beam currents extracted from BeO mixed with both niobium powder and Nb₂O₅ were 2.5~4.6 times higher than those mixed only with niobium powder or with Nb₂O₅. These indicate that the mechanism for high beam current is the homogenousness of BeO produced by expanded Nb₂O₅ powder.