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23. You find an old radioactive source in the back of the cupboard which is labeled “Caesium-137 - 137 Cs-137 Ba+ e, T: = 30.
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230 t= 55 years & & month & (55+ & 6) 4 t= 55.5 years A = A elt where to ln (2) - 0.692 Na Tala THE - (55-5x0.633/00-2) A = (

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