A 0.01 cm thick gold plate is bombarded for 10 minutes with a thermal neutron beam with a flux of 10¹2 neutrons/cm²s. According to reaction Au¹⁹7 (n,7) Au ¹⁹8, Au ¹⁹8 197 198 nuclide is formed with a half-life of 2.7 days. Since the density of gold is 19.3 g/cm³ and the cross section of the reaction is o = 98.7x10-24 cm² a) How many Au ¹⁹8 atoms are formed per cm² of the plate b) Find the activity of the plate in milli Curies
A 0.01 cm thick gold plate is bombarded for 10 minutes with a thermal neutron beam with a flux of 10¹2 neutrons/cm²s. According to reaction Au¹⁹7 (n,7) Au ¹⁹8, Au ¹⁹8 197 198 nuclide is formed with a half-life of 2.7 days. Since the density of gold is 19.3 g/cm³ and the cross section of the reaction is o = 98.7x10-24 cm² a) How many Au ¹⁹8 atoms are formed per cm² of the plate b) Find the activity of the plate in milli Curies
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Transcribed Image Text:A 0.01 cm thick gold plate is bombarded for 10 minutes with a thermal neutron beam
with a flux of 10¹2 neutrons/cm²s. According to reaction Aul⁹7 (n,r) Au⁹8, Au¹⁹8
197
198
nuclide is formed with a half-life of 2.7 days. Since the density of gold is 19.3 g/cm³
and the cross section of the reaction is o = 98.7x10-24 cm²
a) How many Au¹⁹98 atoms are formed per cm² of the plate
b) Find the activity of the plate in milli Curies
Avogadro's number NA-6.02x1023 particles/mole, MA (Au¹97) =197 grams/mole
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