Solve Neutron Density Homework: Indium

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The discussion revolves around calculating neutron density for Indium in a homework problem. Key equations include absorption rate, absorption cross-section, and neutron density formulas. The density of Indium is noted as 7.31 g/cm³, with an atomic mass of 115 g and Avogadro's number at 6.022e24 g/mole. The main confusion arises from the isotopic abundance of 95.7%, leading to uncertainty about which atomic mass to use. Clarification on how to incorporate isotopic abundance into the calculation is sought.
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Homework Statement



The problem is attached

Homework Equations


Absorption rate=flux*absorbtion

absorption=cross section*neutron density

neutron density=Avegadro number *density/atomic mass


The Attempt at a Solution


the problem is just simple but the problem i faced is just with finding the neutron density, for Indium the density 7.31 g/cm3, avegadro no. 06022e24g/mole, atomic mass 115g, i confused with the abundance of 95.7% and with which atomic mass number should I take
 

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