Similar to the well-known proton charge radius puzzle, an analogous puzzle exists for the deuteron charge
radius. There are discrepancies observed in the deuteron radius measured from electron-deuteron (e−d)
scattering experiments as well as from atomic/muonic spectroscopy. In order to help resolve the charge
radius puzzle of the deuteron, the PRad collaboration at Jefferson Lab has proposed an experiment for
measuring the deuteron charge radius, named DRad, by measuring the unpolarized elastic e−d scattering
cross section in a low-Q2 region. To extract the cross section with a high precision, having reliable knowledge
of QED radiative corrections is important. In this talk, we represent the results of numerical calculations
of the lowest-order radiative corrections in e − d scattering for the DRad kinematics. We will simultaneously
discuss radiative corrections in unpolarized electron-proton scattering wherever it is relevant. Ultimately,
we will address the deuteron charge radius puzzle starting from the proton charge radius puzzle.