What is the minimum thickness of aluminum shielding that you would like to have placed around the Sr-90 before?
Your teacher plans to place a much stronger Sr-90 source on your laboratory bench. It is so strong that a radiation monitor placed on your body would register 10,000 counts per second. What is the minimum thickness of aluminum shielding that you would like to have placed around the radioactive source before it is placed in front of you?
Sr-90 emits beta particles (electrons) with about 546 keV energy. A few layers of heavy-duty household aluminum foil about 1 mm thick will stop and absorb virtually all these beta particles. Bear in mind that, because of quantum mechanics, it is theoretically impossible to stop all the particles no matter what the thickness. But what really matters is stopping enough of them so the radiation monitor reading is no higher than background radiation. This is commonly called the ALAR, or As Low As Reasonable, level of radiation leakage from your Sr-90 source.
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