Medical gamma imaging is generally done with the technetium isotope ({ }^{99} mathrm{Tc}^{*}), which decays by emitting

Question:

Medical gamma imaging is generally done with the technetium isotope ${ }^{99} \mathrm{Tc}^{*}$, which decays by emitting a gammaray photon with energy $140 \mathrm{keV}$. What is the mass loss of the nucleus, in $\mathrm{u}$, upon emission of this gamma ray?

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