超低水平液闪谱仪测定雨水、海水中的宇生核素^(32)P和^(33)P

Determination of cosmogenic ^(32)P and ^(33)P in the rainwater and seawater using the ultra low level liquid scintillation spectrometer

本研究旨在建立用超低水平液闪谱仪测定雨水、海水中的宇生核素32P3、3P的方法.通过对液闪谱仪的主要性能与技术参数进行优化设置,对液闪谱仪的效率及能量进行刻度,建立淬灭校正曲线,探讨影响测量本底的因素,实现液闪谱仪对样品的优化测量.并通过液闪谱仪对厦门沿岸地区雨水及厦门湾海水进行测量,得到2004年3月至2005年2月雨水中32P3、3P的月平均比活度分别为0.30×10-2~3.18×10-2、0.28×10-2~3.05×10-2Bq/dm3,33P/32P)A.R.月平均值介于0.74~0.96之间,平均为0.87±0.03;厦门湾海水中32P、33P的比活度分别为1.52×10-2~4.62×10-2、1.28×10-2~3.72×10-2Bq/m3,33P/32P)A.R.为0.81~0.91.

In this study, a new method for the cosmogenic ^32P and ^33P determination in the rainwater and seawater using the ultra low level liquid scintillation spectrometer is developed. By optimizing the counting condition, calibrating the efficiency and energy , and establishing the quench curve, the accuracy of low level counting was enhanced. Using the ultra low level liquid scintillation spectrometer, the activities of ^32P and ^33P in the rainwater and seawater were measured. In the rain sampies, the activities of ^32P, ^33P and ^33P/^32P）A.R. were 0. 30 × 10^-2 ～3. 18 × 10^-2 ,0. 28 × 10^-2 ～ 3.05 × 10^-2 Bq/dm^3 and 0. 74 ～ 0.96 respectively in Xiamen coastal area during March 2004 to February 2005. The activities of ^32P, ^33P and ^33P/^32P）A.R. in the seawater were 1. 52 × 10^-2 ～ 4. 62 × 10^-2 ,1. 28 × 10^-2 ～ 3.72 × 10^-2 Bq/m^3 and 0. 81 ～0. 91 respectively in Xiamen Bay.