Radioactive dating for middle school

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Video taken from WFTS-TV's helicopter last week showed a built-up ring around the hole as crews have begun pumping the mixture inside.The sinkhole, which measures 45 feet in diameter and is 300 feet deep, opened up beneath a pile of waste material at Mosaic, the world's largest supplier of phosphate.That's what we've believed for some time - but recent research makes us wonder if this is true after all.There is some evidence of slight seasonal variations in the rates of radioactive decay of some isotopes, which may be due to temperature differences. Or may be due to something else we don't know about yet.

Alpha particles are made of 2 protons and 2 neutrons.Mosaic has built a concrete plant nearby to keep pumping concrete into the hole during this 'stabilizing phase'.The nucleus consists of protons (p) and neutrons (n), and is extremely small. ) In some types of atom, the nucleus is unstable, and will decay into a more stable atom. It's not the same as what happens in a nuclear power station (where neutrons whizz around and hit uranium nuclei, causing them to split).This means that they have a charge of 2, and a mass of 4 (the mass is measured in "atomic mass units", where each proton & neutron=1) We can write them as , or, because they're the same as a helium nucleus, . They have a low penetrating power - you can stop them with just a sheet of paper.Because they have a large charge, alpha particles ionise other atoms strongly.

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