Determination of lead-210 in an ice core from an Arctic glacier by an alpha-ray measurement

被引：5

作者：

Suzuki, T ^{[1
]}

Maki, A ^{[1
]}

Ohta, K ^{[1
]}

Kamiyama, K ^{[1
]}

Fujii, Y ^{[1
]}

Watanabe, O ^{[1
]}

机构：

[1] NATL INST POLAR RES,TOKYO 173,JAPAN

来源：

ANALYTICAL SCIENCES | 1996年 / 12卷 / 06期

关键词：

alpha spectrometry; lead-210; ice core; chronology; Arctic environment;

D O I：

10.2116/analsci.12.923

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Measurements of Pb-210 (half life of 22.3 y) at various depths down to 180 m in an ice core from an Arctic glacier, Asgardfonna, in northern Spitsbergen have been made. The activity of Pb-210 was obtained by counting alpha-rays from its daughter nuclide, Po-210 (half life of 138 d. The specific activity of Pb-210 at the surface of the glacier, 110 mBq/kg, decreased exponentially with depth to 4.72 mBq/kg at about 30 m depth. Below 30 m, the activities were nearly constant and the average value from 30 m to 180 m was 4.85 +/- 1.33 mBq/kg. This result indicates that the atmospheric Pb-210 deposit onto the glacier decays as a function of time at a rate controlled by its half life. The (y spectrometric method for the determination of Pb-210 in an ice sample and the result of the ice core dating are described in this paper.

引用

页码：923 / 926

页数：4