ΤΑ - A Y ray source is in a lead container. A Geiger counter is used to take intensity readings, I, at a fixed distance

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ΤΑ - A Y ray source is in a lead container. A Geiger counter is used to take intensity readings, I, at a fixed distance from the source, firstly, with 5.10 and 15 mm of aluminium between the source and the counter, and then, with the 15 mm aluminium in place, with 5, 10 and 15 mm of lead. Which of the attached graphs best illustrates the dependence of In I on the total thickness, X, of the absorber? (b) Ole) Oo Old) Ola)