Design, Optimization and Calibration of an Automated Density Gauge for Firn and Ice Cores
Design, Optimization and Calibration of an Automated Density Gauge for Firn and Ice Cores
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冷杉和冰芯自动密度计的设计、优化和校准
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
C. T. Hess
中科院分区：
文献类型：
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作者：
D. Breton;G. Hamilton;C. T. Hess
伽马射线密度计可以提供高分辨率和高精度的降雪和冰芯密度测量。这项研究描述了缅因州自动密度计实验(MADGE)的设计、伽马射线能量优化和质量衰减系数校准，该实验是一种便携式、可现场操作的伽马射线密度计，用于东南极陆地导线。MADGE仪器使用241Am伽马射线源、脉冲模式计数系统和电子岩芯直径卡尺，从直径3-8厘米的积雪和冰芯中采集高精度(±0.004克厘米-3)的密度数据。这些数据是以3.3 mm的空间分辨率收集的，对于直径5 cm的岩心，平均吞吐量为1.5mh-1。
A gamma-ray density gauge can provide high-resolution and high-precision density measurements of firn and ice cores. This study describes the design, gamma-ray energy optimization and mass attenuation coefficient calibration of the Maine Automated Density Gauge Experiment (MADGE), a portable, field-operable gamma-ray density gauge used on overland traverses in East Antarctica. The MADGE instrument uses a 241 Am gamma-ray source, a pulse-mode counting system and electronic core diameter calipers to collect high-precision (±0.004 g cm ―3 ) density data from 3―8 cm diameter firn and ice cores. The data are collected at a 3.3 mm spatial resolution and an average throughput of 1.5 m h ―1 for 5 cm diameter cores.