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A radiation shield is used to attenuate a neutron beam of initial intensity I0=1010[ neutrons / ( cm2.sec)]. If the shield's macroscopic total cross section

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A radiation shield is used to attenuate a neutron beam of initial intensity I0=1010[ neutrons / ( cm2.sec)]. If the shield's macroscopic total cross section is t=0.10cm1, what would be the thickness of the shield for attenuating the neutron beam's intensity by a factor of 1 million (106) times, considering an exponential attenuation of the beam

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