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Measurements of radon as tracer of air pollutants in East Asia

东亚空气污染物示踪剂氡的测量

基本信息

批准号：
10044148
负责人：
IIDA Takao
金额：
$ 2.43万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The study on a long distance transportation of atmospheric pollution and man-made radionuclides has been important. The recent rapid development of computer enables to calculate an enormous and complicated program, and evolve the numerical model available for prediction in a behavior of materials. However, it is now difficult to estimate the movement of all elements considering physical and chemical characteristics. Radon-222 is a noble gas, and has comparatively long half-life of about 3.82d. Therefore, ィイD1222ィエD1Rn is a useful natural radioactive tracer. To measure the atmospheric ィイD1222ィエD1Rn concentrations along the current of air mass from Asian Continent to Japan, Electrostatic continuous ィイD1222ィエD1Rn monitors were set up at Yantai in China, Seoul and Tonhe in Korea, and Oki island, Kanazawa, and Nagoya in Japan.The annual mean ィイD1222ィエD1Rn concentrations were 8.4±1.9 Bq・mィイD1-3ィエD1, 2.2±0.8 Bq・mィイD1-3ィエD1, 3.5±1.1 Bq・mィイD1-3ィエD1, 5.6±0.7 Bq・mィイD1-3ィエD1, 5.3±1.9 Bq・mィイD1-3ィエD1 at Seoul, Gokamura, Yokooyama, Kanazawa, and Nagoya, respectively. The ィイD1222ィエD1Rn concentration at each location showed a clear seasonal pattern of a spring-summer minimum and an autumn-winter maximum. The seasonal variation results from that the monitoring location is covered with mainly a maritime air mass during summer and a continental air mass in winter. The rapid increases of concentrations were often observed when a cold and warm fronts passed over the monitoring location. Then, the atmospheric pollution and OィイD23ィエD2 concentration also showed same variations. The three-dimensional dispersion model could be verified by using a reliable data obtained at Oki island.

对大气污染和人造放射性核素的长距离输送的研究具有重要意义。近年来计算机的快速发展使得能够计算庞大而复杂的程序，并发展出可用于预测材料行为的数值模型。然而，考虑到物理和化学特性，现在很难估计所有元素的运动。 Radon-222是一种惰性气体，半衰期较长，约为3.82d。因此，ィイD1222ィエD1Rn是一种有用的天然放射性示踪剂。为了测量从亚洲大陆到日本的气团流沿线的大气ィイD1222ィエD1Rn浓度，在中国烟台、韩国首尔和通河、日本隐木岛、金泽和名古屋设立了静电连续ィイD1222ィエD1Rn监测仪。ィイD1222ィエD1Rn 浓度为 8.4±1.9 Bq·mィイD1-3ィエD1、2.2±0.8 Bq·mィイD1-3ィエD1、3.5±1.1 Bq·mィイD1-3ィエD1、5.6±0.7 Bq·mィイD1-3ィエD1、 5.3±1.9 Bq・mィイD1-3ィエD1 首尔，分别是五个村、横尾山、金泽和名古屋。各点的ィイD1222ィエD1Rn浓度呈现出春夏最低、秋冬季最高的明显季节规律。季节变化是由于监测点夏季主要为海洋气团覆盖，冬季主要为大陆气团覆盖所致。当冷锋和暖锋经过监测地点时，经常观察到浓度迅速增加。然后，大气污染和OィイD23ィエD2浓度也呈现出同样的变化。三维弥散模型可以利用隐岐岛获得的可靠数据进行验证。