Institute for Medical Research and Occupational Health, Ksaverska cesta 2, HR-10000 Zagreb, Croatia.
J Hazard Mater. 2013 Oct 15;261:584-92. doi: 10.1016/j.jhazmat.2013.08.012. Epub 2013 Aug 12.
Phosphogypsum (PG), a waste product in phosphate fertilizer production, is characterized by technically enhanced natural radioactivity. The presented investigation was performed on a PG deposition site in Croatia. A new approach in the determination of the spread of PG particles from the deposition site into the environment based on the PG particle radioactivity measurements is suggested and explained. The stationary diffusion model was assumed and employed to describe long term PG particle transfer into the surroundings. The advantage of this method is that it requires a minimal number of measurement locations and offers a realistic and reliable distribution of PG particles. The mass concentration of PG particles decreased to the distance of about 3m, at most up to 10 m from the deposition site edge. The results indicate that a unique mechanism of particle transport exists and the migration of PG particles by surface water is the dominant way of their spread. The particle current deduced from the measurements was very low, approximately 4.05 × 10(-2)kg/h, and the migration coefficient was approximately 1.69 × 10(-5)m(2)/h. The obtained results confirmed the initial hypothesis of the stationarity of the migration process, reached within about 6 years.
磷石膏（PG）是磷肥生产中的一种废物，其特点是具有技术增强的天然放射性。本研究在克罗地亚的一个 PG 沉积区进行。本文提出了一种基于 PG 颗粒放射性测量的新方法，用于确定 PG 颗粒从沉积区向环境扩散的范围。假设并采用了稳态扩散模型来描述 PG 颗粒向周围环境的长期转移。该方法的优点在于，它只需要最少数量的测量点，并提供了 PG 颗粒的实际和可靠分布。PG 颗粒的质量浓度在距离沉积区约 3 米处降低，在距离沉积区边缘最多 10 米处降低。结果表明，存在一种独特的颗粒输运机制，地表水携带 PG 颗粒迁移是其扩散的主要方式。从测量中推断出的颗粒流非常低，约为 4.05×10(-2)kg/h，迁移系数约为 1.69×10(-5)m(2)/h。所得结果证实了迁移过程达到稳态的初始假设，这一过程在大约 6 年内完成。
