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Rivers flowing through Ranchi plateau may also contain thorium. By Dr. Nitish Priyadarshi Thorium deposits in India. River flowing near Ranchi city. Pegmatite intrusions in host rocks in Ranchi plateau. Thorium is a naturally occurring radioactive chemical element with the symbol  Th and atomic number 90. It was discovered in 1828 by the Norwegian mineralogist Morten Thrane Esmark and identified by the Swedish chemist Jöns Jakob Berzelius and named after Thor, the Norse god of thunder. Thorium produces a radioactive gas, radon-220, as one of its decay products. Secondary decay products of thorium include radium and actinium. In nature, virtually all thorium is found as thorium-232, which undergoes alpha decay with a half-life of about 14.05 billion years. Berzelius was quite unaware of the tremendous amount of power that this element stores within it. Subsequent development in the field of nuclear science and technology, however, revealed that thorium might well prove to ...

Rivers were overflowing and trees were uprooted. By Dr. Nitish Priyadarshi. Heavy rains on Sunday (13 th Otober) lashed Jharkhand following the "peripheral effect" of cyclone Phailin. The peripheral effect following Phailin that lay centred in Odisha began in Jharkhand since early morning with heavy rains lashing several districts of the state.74.6 mm rain was recorded in Ranchi till 8.30 am. Phailin entered Jharkhand on Sunday around 4am causing heavy rainfall and recorded wind speed of up to 40kmph. Ranchi recorded 117mm rainfall from Sunday 4am till Tuesday morning. Most of the small rivers of Ranchi like Harmu River, Jumar River, Potpoto River, River flowing under the Over bridge etc. were overflowing due to heavy rain in the city. Even many of the local ponds were overflowing. Trees were uprooted and low land area faced water logging.   Pictures below show the some of the impact of Phailin in Ranchi city.             ...