7Be analyses in seawater by low background gamma-spectroscopy

被引：22

作者：

Andrews, J. E. ^{[1
]}

Hartin, C. ^{[2
]}

Buesseler, K. O. ^{[1
]}

机构：

[1] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA

[2] Queens Coll, Queens, NY USA

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2008年 / 277卷 / 01期

基金：

美国国家科学基金会;

关键词：

Seawater;

D O I：

10.1007/s10967-008-0739-y

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Oceanographers use the cosmogenic radionuclide Be-7 (T-1/2 53 days) as a tracer for atmospheric input and a conservative tracer of mixing in the open ocean. This paper elucidates a method for improving the analysis of Be-7 from seawater. The scavenging efficiency of Fe(OH)(3) for each sample is measured by ICP-MS using stable Be-9 as a yield monitor. Samples are gamma-counted in a large diameter (28 mm) well detector. The high purity germanium well detector is coupled with an active anti-coincidence cosmic guard to reduce the spectra background. The improved overall accuracy of the method and lower detection limit of the detector results in a lower volume of seawater needed for analyses. Results will be shown from a study of Be-7 in the Sargasso Sea.

引用

页码：253 / 259

页数：7

共 5 条

[1]

HEUSSER G, 1995, ANNU REV NUCL PART S, V45, P543, DOI 10.1146/annurev.ns.45.120195.002551

[2] Beryllium-7 as a tracer of surface water subduction and mixed-layer history [J].

Kadko, D ;

Olson, D .

DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 1996, 43 (02) :89-116

[3] A new low background gamma spectrometer equipped with an anti-cosmic device [J].

Laurec, J ;

Blanchard, X ;

Pointurier, F ;

Adam, A .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1996, 369 (2-3) :566-571

[4] Recent developments in radiometric and mass spectrometry methods for marine radioactivity measurements [J].

Povinec, PP ;

La Rosa, JJ ;

Lee, SH ;

Mulsow, S ;

Osvath, I ;

Wyse, E .

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, 2001, 248 (03) :713-718

[5] An active background discrimination technique using a multiple detector event by event recording system [J].

Wordel, R ;

Mouchel, D ;

Steinbauer, E ;

Oyrer, R .

APPLIED RADIATION AND ISOTOPES, 1996, 47 (9-10) :1061-1067

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