69. The dose equivalent is the product of the absorbed dose and the RBE factor, so the absorbed dose is
(dose equivalent)/(RBE) = (250×10-6 Sv)/(0.85) = 2.94×10-4 Gy. But 1Gy = 1J/kg, so the absorbed
dose is


J
2.94 × 10-4 Gy 1 =2.94 × 10-4 J/kg .
kg·Gy
To obtain the total energy received, we multiply this by the mass receiving the energy: E =(2.94 ×
10-4 J/kg)(44 kg) = 1.29 × 10-2 J.