Structural and optical properties of a new Milarite type Na Mg LiSi O :Eu phosphor.

A new red-emitting Eu (1-17 mol%)-doped Na Mg LiSi O (NMLS) phosphor was prepared using a conventional solid-state reaction method at low temperature. The prepared samples belong to a hexagonal structure with a good match to JCPDS card no. 73-0934.

Inhalation Dose and Source Term Studies in a Tribal Area of Wayanad, Kerala, India.

Among radiation exposure pathways to human beings, inhalation dose is the most prominent one. Radon, thoron, and their progeny contribute more than 50 per cent to the annual effective dose due to natural radioactivity. South west coast of India is classified as a High Natural Background Radioactivity Area and large scale data on natural radioactivity and dosimetry are available from these coastal regions including the Neendakara-Chavara belt in the south of Kerala.