What is the gamma emission energy of radio nuclide 125I?

The gamma emission energy of the radioisotope iodine-125 (125I) is approximately 28 keV. This characteristic energy is important in medical applications, particularly in brachytherapy, where 125I is widely used in the treatment of prostate cancer and other localized tumors. The relatively low energy of 28 keV allows for the effective dose distribution in nearby tissues while minimizing damage to surrounding healthy cells.

This specific energy level also contributes to the isotope's favorable radiation profile for therapeutic and diagnostic purposes. Understanding the emission energy helps medical dosimetrists calculate the appropriate dose for treatment and assess the potential impact on structures adjacent to the targeted tissue.