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 30.2y. In 1996, the total activity of this contamination over an area of 2.6 x 10s km2 was estimated to be 1 x 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.)