(a) Given the incident of 10⁸ 662 KeV gamma rays, what is the thickness of the lead shield that can reduce 662keV gamma rays to 10⁵ after penetrating the lead body?

(b) In the same situation, what is the thickness of a lead shield that can reduce all energy gamma rays to 10⁵?

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662 keV gamma ray Unit: cm/g ст ***** Energy (MeV) Scattering Photoelectric Total Attenuation (Incoherent) **** Absorption 0.5 6.734 x 102 8.257 x 102 1.613 x 101 108 105 0,6 6.263 x 10-2 5.406 x 10 2 1.248 x 101 0.8 5.537 x 102 2,871 x 10 2 8.870 x 102 1.0 4.993 x 102 1.810 x 10 2 ****** 7.102 x 102 ?7? cm Pb (11.34 g/cm³) 662 keV gamma ray Unit: cm/g ст ***** Energy (MeV) Scattering Photoelectric Total Attenuation (Incoherent) **** Absorption 0.5 6.734 x 102 8.257 x 102 1.613 x 101 108 105 0,6 6.263 x 10-2 5.406 x 10 2 1.248 x 101 0.8 5.537 x 102 2,871 x 10 2 8.870 x 102 1.0 4.993 x 102 1.810 x 10 2 ****** 7.102 x 102 ?7? cm Pb (11.34 g/cm³)