Compute for 3H the mean energy per nuclear disintegration, Δ. The SI unit for Δ is kg Gy Bq-1 s-1 identical with J Bq-1 S-1. The effective half-life for tritium in body water is 10.5 days. Assume the injection of 50 MBq of tritium labeled water. What is the average absorbed dose in water after the elapse of three half-lives? Assume equilibrium conditions of energy deposition.