Questions tagged [isotopes]

It is mentioned everywhere that the percentage of Uranium 235 isotope found in natural uranium is 0.711%. Samples collected from ores around the earth also seem to attest to this claim. Is U-235 0.711 % anywhere on Earth? What about the Uranium…

It is known that pure heavy water will quickly get contaminated by light hydrogen atoms if exposed to air due to isotope exchange. Does the same thing happens when heavy water is stored in plastic container, which also contains light hydrogen atoms?

Technetium -99 can travel though the blood stream. A detector outside the patient's body detects gamma rays, and uses this to form a picture of a flow of blood. Technetium has a half life of 6 hours. Why do radiologists use technetium -99 to image…

With these two elements how can the isotope half-life be determined using first order kinetics? nobelium-259 half-life recorded @ 58 minutes fermium-253 half-life recorded @ 3 days Although I do not know, there is probably an average starting…