ACCURACIES IN PO-210 DETERMINATION FOR PB-210 DATING

被引:31
作者
ELDAOUSHY, F
OLSSON, K
GARCIATENORIO, R
机构
[1] DEPT QUATERNARY GEOL,S-75122 UPPSALA,SWEDEN
[2] FAC FIS SEVILLA,E-41080 SEVILLE,SPAIN
关键词
AQUATIC DEPOSITS; PB-210; 210PO; SPECIATION; DATING; ALPHA-SPECTROMETRY; ACCURACIES IN ALPHA-COUNTING;
D O I
10.1007/BF00050930
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Various laboratory techniques have been utilized worldwide for measuring lead-210 in sub-recent deposits through its grand-daughter product polonium-210. Isotope dilution alpha spectrometry proved a suitable tool for absolute determination of lead-210 for the dating of aquatic deposits. Moreover, isotope dilution alpha spectrometry along with speciation experiments can be used to resolve depositional anomalies arising from supported lead-210/Ra-226 disequilibrium levels and unsupported lead-210 mobile fractions. Isotope dilution alpha spectrometry of sub-recent sediment and peat deposits has been critically evaluated for more than ten years. Our results show that type, size and composition of deposits analyzed as well as radiochemical procedures used, together with alpha counting techniques, are important factors influencing lead-210 determinations and tailing corrections using its granddaughter product polonium-210. Optimization of these parameters is of prime importance to achieve economic and accurate analyses, especially at low lead-210 concentrations and small sample sizes.
引用
收藏
页码:43 / 52
页数:10
相关论文
共 26 条
[1]   PB-210 BALANCE IN LONG-ISLAND SOUND [J].
BENNINGER, LK .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1978, 42 (08) :1165-1174
[2]   EFFECTS OF BIOLOGICAL SEDIMENT MIXING ON THE PB-210 CHRONOLOGY AND TRACE-METAL DISTRIBUTION IN A LONG ISLAND SOUND SEDIMENT CORE [J].
BENNINGER, LK ;
ALLER, RC ;
COCHRAN, JK ;
TUREKIAN, KK .
EARTH AND PLANETARY SCIENCE LETTERS, 1979, 43 (02) :241-259
[3]  
BLOESCH J, 1982, HYDROBIOLOGIA, V92, P579
[4]   PB-210 SEDIMENT GEOCHRONOLOGY IN A CHANGING COASTAL ENVIRONMENT [J].
CHANTON, JP ;
MARTENS, CS ;
KIPPHUT, GW .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1983, 47 (10) :1791-1804
[5]   DETERMINATION OF RECENT DEPOSITION RATES IN LAKE CONSTANCE WITH RADIOISOTOPIC METHODS [J].
DOMINIK, J ;
MANGINI, A ;
MULLER, G .
SEDIMENTOLOGY, 1981, 28 (05) :653-677
[6]   NEW PROCEDURE FOR DETERMINATION OF PB-210 IN LAKE AND MARINE-SEDIMENTS [J].
EAKINS, JD ;
MORRISON, RT .
INTERNATIONAL JOURNAL OF APPLIED RADIATION AND ISOTOPES, 1978, 29 (9-10) :531-536
[8]  
EAKINS JD, 1975, AERER7923 UK AT EN A
[9]   PB-210 AND HEAVY-METAL CONTENTS IN DATED OMBROTROPHIC PEAT HUMMOCKS FROM FINLAND [J].
ELDAOUSHY, F ;
TOLONEN, K .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1984, 223 (2-3) :392-399
[10]   SPECIATION OF PB-210/PO-210 IN AQUATIC SYSTEMS AND THEIR DEPOSITS [J].
ELDAOUSHY, F ;
GARCIATENORIO, R .
SCIENCE OF THE TOTAL ENVIRONMENT, 1988, 69 :191-209