...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Separation of 90Sr from radioactive waste matrices--microwave versus fusion decomposition.
【24h】

Separation of 90Sr from radioactive waste matrices--microwave versus fusion decomposition.

机译：从放射性废物基质中分离90Sr-微波与聚变分解。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Radioactive waste (slurry) from a detention pond deriving from two research reactors and several inactive and active drain outlets at the Paul Scherrer Institute are the basis for the current (90)Sr investigation. For decomposition, a microwave method was applied, where 1g of dry-ashed slurry was partially dissolved (HNO(3) (65%)/H(2)O(2) (30%); v:v=8:2). In this slurry we obtained an (90)Sr activity of 5.3+/-0.2 Bq/g in solution. In a second run, we applied a borate-fusion (Li metaborate/Li tetraborate (80:20 w/w%) dissolving 1g of dry-ashed "Si-free" slurry at 1100 degrees C in a muffle furnace. We achieved an (90)Sr activity of (7.8+/-0.3)Bq/g, yet observing BaSO(4) precipitation during the chromatographical separation of Sr. An alkali fusion using Na(2)CO(3) was done using the Bunsen burner and the muffle furnace for 20 min at 1000 degrees C, in combination. During formation of the hot glass, the surplus of Na(2)CO(3), produced Na(2)SO(4) and BaCO(3) in solid form. The hot glass was dissolved in deionised water, removing thus the SO(4)(2-) ions. Dissolving the residue directly in HNO(3), solves Ba as Ba(NO(3))(2) and thus we achieved over 80% of the (133)Ba activity in the solution, as measured by gamma-spectrometry. (85)Sr tracer of 88.0%+/-3.3% was recovered, yielding on average in (7.4+/-0.3)Bq/g of (90)Sr activity. The increase of 2.1-2.5 Bq/g of (90)Sr activity achieved with the alkali fusion, and the Li metaborate/Li tetraborate 80:20 w/w% fusion, respectively, clearly shows that some Sr must have been present as SrSO(4) in the slurry.
机译：Paul（Scherrerer）研究所的两个研究反应堆以及几个非活动和活动排水口产生的滞留池中的放射性废物（泥浆）是当前（90）Sr研究的基础。为了分解，应用了微波方法，其中部分溶解了1g干灰浆（HNO（3）（65％）/ H（2）O（2）（30％）; v：v = 8：2） 。在此浆液中，我们在溶液中获得的（90）Sr活性为5.3 +/- 0.2 Bq / g。在第二轮中，我们在马弗炉中于1100℃下使用硼酸盐熔合液（偏硼酸锂/四硼酸锂（80:20 w / w％）溶解1克干灰化的“无硅”浆料）。 （90）Sr活性为（7.8 +/- 0.3）Bq / g，但在Sr色谱分离过程中仍观察到BaSO（4）沉淀。使用本生灯和Na（2）CO（3）进行碱熔将马弗炉在1000摄氏度下混合20分钟，在热玻璃形成过程中，多余的Na（2）CO（3）产生固态的Na（2）SO（4）和BaCO（3）将热玻璃溶解在去离子水中，从而除去SO（4）（2-）离子，将残余物直接溶解在HNO（3）中，将Ba溶解为Ba（NO（3））（2），从而实现γ光谱法测得溶液中（133）Ba活性的80％以上。（85）Sr示踪剂的回收率为88.0％+ /-3.3％，平均产生（7.4 +/- 0.3）Bq / g（90）Sr活性的克。通过碱熔和L达到（90）Sr活性的2.1-2.5 Bq / g偏硼酸/四硼酸锂80:20 w / w％熔合分别清楚地表明，浆液中一定存在某些Sr作为SrSO（4）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号