Zone Refining of Ultrahigh-Purity Sodium Iodide for Low-Background Detectors
Zone Refining of Ultrahigh-Purity Sodium Iodide for Low-Background Detectors
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低本底探测器用超高纯碘化钠的区域精炼
DOI：
10.1103/physrevapplied.16.014060
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发表时间：
2021
影响因子：
4.6
通讯作者：
Souza, Michael
中科院分区：
文献类型：
--
作者：
Suerfu, Burkhant;Calaprice, Frank;Souza, Michael
超高纯度低本底（）晶体用于暗物质的直接探测越来越受到人们的关注。过去的研究表明，区域精炼是一种有效和可扩展的净化方式。特别是，和两个元素的放射性同位素，可以导致闪烁背景，可以有效地删除区提纯。然而，区域精炼从未被证明用于超高纯度，这在最近已经商业化。在本文中，我们表明，许多常见的金属杂质可以有效地通过区域精炼。建立了一个预测杂质最终分布的数值模型，并用于拟合电感耦合等离子体质谱（ICPMS）测量数据，确定分离系数和初始浓度。在此方案下，估算出的偏析系数为，表明区域精炼在去除超高纯中的杂质方面仍然是有效的。由于区域精炼倾向于将杂质移动到一端，因此由于富集，最终可能会检测到浓度太低而无法直接在未加工粉末中测量的元素。提出了一种利用部分数据估计杂质初始浓度的分析方法，有效地提高了光谱仪的灵敏度。使用这种技术，初始浓度的估计是在万亿分之五（ppt）和14 ppt之间，在90%的置信水平（CL），至少14倍低于ICPMS的检测限和7倍低于目前最严格的限制由DAMA合作所设定的直接计数的放射性。这些结果表明，区带细化是开发下一代暗物质直接探测晶体闪烁器的关键技术。
There has been a growing interest in ultrahigh-purity low-background() crystals for dark-matter direct searches. Past research indicates that zone refining is an efficient and scalable way to purify. In particular,and—two elements with radioisotopes that can cause scintillation backgrounds—can be efficiently removed by zone refining. However, zone refining has never been demonstrated for ultrahigh-purity, which has become commercially available recently. In this paper, we show that many common metallic impurities can be efficiently removed via zone refining. A numerical model for predicting the final impurity distribution is developed and used to fit the inductively coupled plasma mass spectrometry (ICPMS) measurement data to determine the segregation coefficient and the initial concentration. Under this scheme, the segregation coefficient foris estimated to be, indicating that zone refining is still effective in removingfrom ultrahigh-purity. As zone refining tends to move the impurities to one end, elements with concentrations too low to be measured directly in the unprocessed powder can potentially be detected in the end due to the enrichment. We also present an analysis technique to estimate the initial concentrations of impurities with partial data, which effectively enhances the sensitivity of the spectrometer. Using this technique, the initial concentration ofis estimated to be between 5 parts per trillion (ppt) and 14 ppt at the 90% confidence level (CL), at least 14 times lower than the detection limit of ICPMS and 7 times lower than the current most stringent limit set by the DAMA collaboration by direct counting of radioactive. These results imply that zone refining is a key technique in developing next-generation-based crystal scintillators for dark-matter direct detection.
碱金属碘化物的区域纯化
DOI：
--
发表时间：
1970
期刊：
影响因子：
--
作者：
U. Gross
通讯作者：
U. Gross
影响因子：
3.5
作者：
M. Antonello;E. Barberio;T. Baroncelli;J. Benziger;L. Bignell;I. Bolognino;F. Calaprice;S. Copello;D. D’Angelo;G. D’Imperio;I. Dafinei;G. D. Carlo;M. Diemoz;A. D. Ludovico;A. Duffy;F. Froborg;G. Giovanetti;E. Hoppe;A. Ianni;L. Ioannucci;S. Krishnan;G. Lane;I. Mahmood;A. Mariani;P. McGee;P. Montini;J. Mould;F. Nuti;D. Orlandi;M. Paris;V. Pettinacci;L. Pietrofaccia;D. Prokopovich;S. Rahatlou;N. Rossi;A. Sarbutt;E. Shields;M. Souza;A. Stuchbery;B. Suerfu;C. Tomei;P. Urquijo;C. Vignoli;M. Wada;A. Wallner;A. G. Williams;J. Xu;M. Milano;Milano;Italy;S. O. Physics;The University of Melbourne;Melbourne;Australia;Chemical Engineering Department;Princeton University;Princeton;Nj;USA.;D. Physics;The Australian National University;Canberra;D. Fisica;U. D. S. D. Milano-U.-D.-S.-D.-Milano-102421132;P. Department;I. G. Sasso;Assergi;I. -. G. S. S. Institute-I.-.-G.-S.-S.-Institute-102945001;Infn Roma;Roma;A. J. W. H. C. F. Astrophysics;Centre for Gravitational Astrophysics;Supercomputing;S. U. Technology;I. -. London;High Energy Physics;B. Laboratory;United Kingdom.;P. N. N. Laboratory-P.-N.-N.-Laboratory-7290024;Richland;Wa;The University of Adelaide;Adelaide;South Australia.;S. Roma;Australian Nuclear Science;Technology Organization;Lucas Heights
通讯作者：
M. Antonello;E. Barberio;T. Baroncelli;J. Benziger;L. Bignell;I. Bolognino;F. Calaprice;S. Copello;D. D’Angelo;G. D’Imperio;I. Dafinei;G. D. Carlo;M. Diemoz;A. D. Ludovico;A. Duffy;F. Froborg;G. Giovanetti;E. Hoppe;A. Ianni;L. Ioannucci;S. Krishnan;G. Lane;I. Mahmood;A. Mariani;P. McGee;P. Montini;J. Mould;F. Nuti;D. Orlandi;M. Paris;V. Pettinacci;L. Pietrofaccia;D. Prokopovich;S. Rahatlou;N. Rossi;A. Sarbutt;E. Shields;M. Souza;A. Stuchbery;B. Suerfu;C. Tomei;P. Urquijo;C. Vignoli;M. Wada;A. Wallner;A. G. Williams;J. Xu;M. Milano;Milano;Italy;S. O. Physics;The University of Melbourne;Melbourne;Australia;Chemical Engineering Department;Princeton University;Princeton;Nj;USA.;D. Physics;The Australian National University;Canberra;D. Fisica;U. D. S. D. Milano-U.-D.-S.-D.-Milano-102421132;P. Department;I. G. Sasso;Assergi;I. -. G. S. S. Institute-I.-.-G.-S.-S.-Institute-102945001;Infn Roma;Roma;A. J. W. H. C. F. Astrophysics;Centre for Gravitational Astrophysics;Supercomputing;S. U. Technology;I. -. London;High Energy Physics;B. Laboratory;United Kingdom.;P. N. N. Laboratory-P.-N.-N.-Laboratory-7290024;Richland;Wa;The University of Adelaide;Adelaide;South Australia.;S. Roma;Australian Nuclear Science;Technology Organization;Lucas Heights
使用 SiX4 作为去除剂生长具有较低浓度的含氧阴离子的碱金属卤化物晶体
DOI：
--
发表时间：
1968
期刊：
影响因子：
--
作者：
J. Eckstein;U. Gross;E. Rubinova
通讯作者：
E. Rubinova