Becquerel, gray and sievert - measuring radioactivity: from fizzics.org
The units of bequerel, gray and sievert measure activity, absorbed dose and dose equivalent. Taking a precise numerical measurement of the radioactivity of a source is difficult and understanding the various units of measurement is far from straightforward. The video explains the definitions of the units and the methods and how they are used.
Supporting notes are here:
www.fizzics.org/measuring-rad...
If you want to check on the properties of different types of radiation then you might find these links useful:
What are alpha, beta and gamma radiation - • What are alpha, beta a...
Radioactivity explained: • Radioactive decay expl...
Beta plus and beta minus • Beta minus and beta pl...
or on the linked website: www.fizzics.org/what-is-radio...
Пікірлер: 5
Thank you for the clear explanation and examples!
Thanks. Good explanations :-)
Taking a precise measurement of the radioactivity of a source depends on statistics, the sq root of the count is the standard deviation. The precision increases as the period of counting increases. Of course for weak sources or those with a very short half-life it does get more difficult, but for long-lived isotopes, it is not particularly difficult. I have measured the half-life of thoron (Rn220) with fairly elementary equipment to about four significant figures.
1:33 ("neutron, from fission reaction") But isn't the primary example, with alpha emission, already a fission reaction?
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2 жыл бұрын
Depends on the exact definition but most involve splitting of a large atom by a neutron into two parts of similar size releasing a large amount of energy.