Because of the 1986 explosion and fire in a reactor at the
Chapter , Problem 80(choose chapter or problem)
Because of the 1986 explosion and fire in a reactor at the Chernobyl nuclear power plant in northern Ukraine, part of Ukraine is contaminated with 137Cs, which undergoes beta-minus decay with a half- life of 30.2 y. In 1996, the total activity of this contamination over an area of 2.6 " 105 km2 was estimated to be 1 " 1016 Bq. Assume that the 137Cs is uniformly spread over that area and that the beta-decay electrons travel either directly upward or directly downward. How many beta-decay electrons would you intercept were you to lie on the ground in that area for 1 h (a) in 1996 and (b) today? (You need to estimate your cross-sectional area that intercepts those electrons.)
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