A thin foil of certain stable isotope is irradiated by thermal neutrons falling normally on its surface Due to the capture of neutrons a radionuclide with decay constant appears Find the law describing accumulation of that radionuclide N (t) per unit area of the foil 's surface The neutron flux den...

Rate of formation of the radionuclide is nJo per unit are ...

A thin foil of certain stable isotope is irradiated by thermal neutrons falling normally on its surface.

Question:

A thin foil of certain stable isotope is irradiated by thermal neutrons falling normally on its surface. Due to the capture of neutrons a radionuclide with decay constant λ appears. Find the law describing accumulation of that radionuclide N (t) per unit area of the foil's surface. The neutron flux density is J, the number of nuclei per unit area of the foil's surface is n, and the effective cross- section of formation of active nuclei is