共查询到20条相似文献,搜索用时 843 毫秒
1.
2.
3.
A. D. Sajeniouk 《Journal of Radioanalytical and Nuclear Chemistry》2005,264(2):337-342
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Zal U’yun Wan Mahmood Che Abd Rahim Mohamed Mei Wo Yii Zaharudin Ahmad Kamaruzzaman Ishak Abdul Kadir Ishak 《Journal of Radioanalytical and Nuclear Chemistry》2010,286(1):107-113
Inventories and fluxes of 210Pb, 228Ra and 226Ra were determined in sediment cores collected at nine stations covering of the southern South China Sea and Malacca Straits
with the thickness of water column between 42 and 83 m depth. The inventories of 210Pb, 228Ra and 226Ra were calculated range from 0.15–2.55 Bq cm−2, 0.05–0.40 Bq cm−2 and 6.83–83.63 Bq cm−2, meanwhile the fluxes ranged from 0.005–0.079 Bq cm−2 yr−1, 0.009–0.048 Bq cm−2 yr−1 and 0.003–0.037 Bq cm−2 yr−1, respectively. The results show that the highest inventories and fluxes for 210Pb, 228Ra and 226Ra were found at station WC 01 and EC 05. Because there are additional sources of 210Pb, 228Ra and 226Ra, where water transport will brings more dissolved isotopes, influence of the transportation and deposition of suspended
particles, fast rate of regeneration and greater production of those radionuclides and others. 相似文献
18.
Wu Men Fenfen Wang Guangshan Liu 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(1):189-195
The activities of 224Ra in the East China Sea (ECS) were measured by the Mn-fiber adsorption—emanation method. The horizontal and vertical distributions
of 224Ra in the ECS in summer and winter were studied. The ranges of 224Ra activities were < lowest limit of detection (LLD)–5.88 Bq/m3 in summer with an average of 0.85 Bq/m3, and < LLD-7.50 Bq/m3 in winter with an average of 0.72 Bq/m3. And the distributions of 224Ra in the surface water were similar in these two seasons, decreasing rapidly with the increasing distance from the coast.
The high 224Ra area was located within 30–100 km offshore and the lowest activities appeared in the Kuroshio Current. The vertical distributions
of 224Ra showed two different characteristics. The horizontal and vertical eddy diffusion coefficients calculated by the one-dimensional
state model of 224Ra were (7.1–88.9) × 106cm2/s and 2.18–163 cm2/s, respectively. The upwelling rates off Zhejiang Province were calculated from 224Ra vertical distribution, which varied from 8.4 × 10−3cm/s to 13.3 × 10−3cm/s in summer and 16.3 × 10−3cm/s to 16.8 × 10−3cm/s in winter. 相似文献
19.