Saroja P Mary, Immanuel G, Raj G Allen Gnana, Selvan K Esai
Department of Chemistry, Holy Cross College, Nagercoil--629 004, India.
J Environ Biol. 2012 Sep;33(5):909-15.
Studies on natural and anthropogenic radioactivity assume greater importance in the context of human health and development. Hence two species of seaweeds viz: Gracilaria edulis and Ulva lactuca, from three high background radiation areas (Arockiapuram, Kadiapattinam and Kurumpanai) on the southwest coast of Tamil Nadu, and Mandapam as low background radiation area of the southeast coast of Tamil Nadu were studied for variations in activity concentration of 228Ra, 40K, 238U and 228Th. Among these radionuclides, 40K recorded significant inter-species variation while 238 U and 228Th showed significant association. The overall mean concentration of radionuclides was found high in G. edulis (5.31,57.49,36.05,356.55 Bq kg(-1) for 228Ra, 40K, 238U, 228Th respectively), while the mean concentrations for U. lactuca were 4.88, 42.35, 34.40,347.70 Bqkg(-1) for 228Ra, 40K, 238U, 228Th respectively. The mean concentration of radionuclides was uniformly found low during northeast monsoon season in both the seaweed species.
在人类健康与发展的背景下，对天然和人为放射性的研究具有更重要的意义。因此，对来自泰米尔纳德邦西南海岸三个高本底辐射区（阿罗基亚普拉姆、卡迪亚帕蒂南和库伦帕奈）的两种海藻，即食用龙须菜和石莼，以及作为泰米尔纳德邦东南海岸低本底辐射区的曼达帕姆，进行了²²⁸Ra、⁴⁰K、²³⁸U和²²⁸Th活度浓度变化的研究。在这些放射性核素中，⁴⁰K记录到显著的种间差异，而²³⁸U和²²⁸Th显示出显著的相关性。发现食用龙须菜中放射性核素的总体平均浓度较高（²²⁸Ra、⁴⁰K、²³⁸U、²²⁸Th分别为5.31、57.49、36.05、356.55 Bq kg⁻¹），而石莼中²²⁸Ra、⁴⁰K、²³⁸U、²²⁸Th的平均浓度分别为4.88、42.35、34.40、347.70 Bq kg⁻¹。在东北季风季节，两种海藻中的放射性核素平均浓度均普遍较低。
