SAMPLE PREPARATION FOR THE DETERMINATION OF RADIOCALCIUM BY ACCELERATOR MASS-SPECTROMETRY

被引：4

作者：

SHARMA, P ^{[1
]}

MIDDLETON, R ^{[1
]}

FINK, D ^{[1
]}

KLEIN, J ^{[1
]}

机构：

[1] UNIV PENN,DEPT PHYS,TANDEM ACCELERATOR LAB,PHILADELPHIA,PA 19104

来源：

ANALYTICA CHIMICA ACTA | 1990年 / 233卷 / 01期

关键词：

D O I：

10.1016/S0003-2670(00)83465-0

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An accelerator mass spectrometric (AMS) technique has been developed for determining 41Ca/40Ca ratios at terrestrial levels of 10-16-10-14. Calcium is extracted as calcium oxide from bone and rock samples. The calcium oxide is converted into calcium metal and subsequently into calcium hydride in a two-step reduction process. From these calcium hydride samples 5-10 μA of a negative-ion beam of CaH-3 is produced. A new gas-ionization detector and a high-resolution velocity detector allow discrimination against 41K and the stable isotopes of Ca, resulting in background levels of less than 6 × 10-16. Hence it is possible (for the first time without pre-enrichment) to study the distribution of 41Ca in the terrestrial environment. The AMS method for 41Ca determination is applicable to samples of less than 1 g. © 1990.

引用

页码：101 / 110

页数：10

共 19 条

[1]

Bloom A.L., 1978, GEOLOGY EFATE OFFSHO, P47

[2] PRECISE TIMING OF THE LAST INTERGLACIAL PERIOD FROM MASS-SPECTROMETRIC DETERMINATION OF TH-230 IN CORALS [J].

EDWARDS, RL ;

CHEN, JH ;

KU, TL ;

WASSERBURG, GJ .

SCIENCE, 1987, 236 (4808) :1547-1553

[3] ACCELERATOR MASS-SPECTROMETRY FOR MEASUREMENT OF LONG-LIVED RADIOISOTOPES [J].

ELMORE, D ;

PHILLIPS, FM .

SCIENCE, 1987, 236 (4801) :543-550

[4] CA-41 - MEASUREMENT BY ACCELERATOR MASS-SPECTROMETRY AND APPLICATIONS [J].

FINK, D ;

MIDDLETON, R ;

KLEIN, J ;

SHARMA, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1990, 47 (01) :79-96

[5] 1972 VALUES FOR INTERNATIONAL GEOCHEMICAL REFERENCE SAMPLES [J].

FLANAGAN, FJ .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1973, 37 (05) :1189-1200

[6]

HENNING W, 1987, SCIENCE, V236, P727

[7]

MABOUCHI H, 1974, J INORG NUCL CHEM, V36, P1687

[8]

MIDDLETON R, 1989, RADIOCARBON, V31, P305

[9] A VERSATILE HIGH-INTENSITY NEGATIVE-ION SOURCE [J].

MIDDLETON, R .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, 1983, 214 (2-3) :139-150

[10]

MIDDLETON R, 1986, WORKSHOP TECHNIQUES, P127

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