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This means that beta particles are the same as an electron. Gamma rays have a high penetrating power - it takes a thick sheet of metal such as lead, or concrete to reduce them significantly.

We can write them as or, because they're the same as an electron, . Beta particles have a medium penetrating power - they are stopped by a sheet of aluminium or plastics such as perspex. Gamma rays do not directly ionise other atoms, although they may cause atoms to emit other particles which will then cause ionisation.

Because they have a large charge, alpha particles ionise other atoms strongly.

Beta particles have a charge of minus 1, and a mass of about 1/2000th of a proton.

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.

For now, for GCSE exams, let's go along with the idea that the rate of radioactive decay does not depend on external factors.

In order to ascertain the ages of samples which were formed in equilibrium with different reservoirs to these materials, it is necessary to provide an age correction.

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That's what we've believed for some time - but recent research makes us wonder if this is true after all.

[A Conventional Radiocarbon Age or CRA, does not take into account specific differences between the activity of different carbon reservoirs.

A CRA is derived using an age calculation based upon the decay corrected activity of the absolute radiocarbon standard (1890 AD wood) which is in equilibrium with atmospheric radiocarbon levels (as mentioned previously, 1890 wood is no longer used as the primary radiocarbon standard, instead Oxalic Acid standards I and II were correlated with the activity of the original standard).

Warning about fakes using ancient materials What about airport x-rays and radiography? Thus, when one measures dose in pottery, it is the dose accumulated since it was fired, unless there was a subsequent reheating.

When pottery is fired, it loses all its previously acquired TL, and on cooling the TL begins again to build up.

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