Free radon production from uranium tailings under frozen and non-frozen conditions

IF 1.6 3区化学 Q3 CHEMISTRY, ANALYTICAL Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-01-06 DOI:10.1007/s10967-024-09948-y

Yongjun Ye, Yifan Zong, Mengyi Li, Bangzhi Song

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Abstract

The effect of conventional factors on the free radon production rate above 0 °C has been widely studied, but rarely explored under frozen conditions. In order to investigate the effect on the free radon production rate of uranium tailings under frozen and non-frozen conditions, uranium tailings from southern China were selected for screening, and temperature, water–solid mass ratio and particle size were used as influencing factors for research. The stable radon concentration and the free radon production rate of uranium tailings of varying particle sizes at different temperatures (20 °C, 0 °C, − 10 °C, − 20 °C) and different water–solid mass ratios (0, 0.14, 0.28) were measured by the homemade radon collection tanks. The experimental results showed that: (1) The free radon production rate decreases with temperature decreases, more significantly under frozen conditions, dropping 3.49–4.16% per 1 °C on average. (2) Under non-frozen conditions, the free radon production rate rises with water–solid mass ratio rises, while under frozen conditions, the free radon production rate of uranium tailings first increases and then decreases with the increase of water–solid mass ratio. (3) The larger particle size, the lower the free radon production rate. The free radon production rate of uranium tailings with particle size > 450 μm is 21.3–81.1% lower than that of uranium tailings with other particle sizes.

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冻结和非冻结条件下铀尾矿的游离氡生产

常规因素对0℃以上游离氡产率的影响已被广泛研究，但在冷冻条件下很少探索。为了研究冻结和非冻结条件下铀尾矿游离氡产率的影响，选取中国南方铀尾矿进行筛选，以温度、水固质量比和粒度为影响因素进行研究。采用自制的氡收集罐，测定了不同粒径铀尾矿在不同温度（20℃、0℃、- 10℃、- 20℃）和不同水固质量比（0、0.14、0.28）下的稳定氡浓度和游离氡产率。实验结果表明：(1)游离氡产率随温度的降低而降低，在冷冻条件下更明显，平均每1°C下降3.49 ~ 4.16%。(2)在非冻结条件下，自由氡产率随水固质量比的增大而增大，而在冻结条件下，铀尾矿的自由氡产率随水固质量比的增大先增大后减小。(3)粒径越大，游离氡生成速率越低。粒径为>； 450 μm的铀尾矿的游离氡产率比其他粒径的铀尾矿低21.3 ~ 81.1%。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.