In a positron decay, the radionuclide $$^{11}\mathrm{C}$$ decays according to $$^{11}\mathrm{C}\rightarrow{}^{11}\mathrm{B}+e^++\nu$$. The respective atomic masses are $$^{11}\mathrm{C}=11.01142\ \mathrm{u}$$, $$^{11}\mathrm{B}=11.00931\ \mathrm{u}$$ and the mass of positron equals the mass of electron, $$m_e=0.00055\ \mathrm{u}$$. The disintegration energy, that is the $$Q$$ value, is approximately