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" "This thing... is a , and it will tell us whether these things are radioactive. ...There is something coming off [clicking noise from the thoriated rods] there. Just to demonstrate that the bananas are really only mildly radioactive, we can't pick them up with a Geiger counter. It's really is very mild.
Suzanne Lyn Sheehy (born 1984) is an Australian accelerator physicist who runs research groups at the University of Oxford and the , where she is developing new s for applications in medicine.
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So they had to put a lot of effort into designing... the , which is a massive long block of very dense , which absorbs the energy. But even then there's so much energy that they can't just dump it directly on it, or the would make the thing explode. So they actually have to paint the beam in... a swirly pattern... to spread out the load of the heat from the beam on this huge graphite block.
Now is the stuff that does us damage, and there's three... types... called alpha, beta and gamma radiation. ...Alpha radiation won't go through your hand, beta radiation won't go through a piece of aluminum [a few millimeters thick] and gamma radiation is penetrating and won't go through a big piece of .