If 2.50 pCi [1 pCi (picocurie)= 1X10⁻¹²2 Ci] of radioactivity from ²³⁹Pu is emitted in a 95-kg human for 65 h, and each disintegration has an energy of 8.25X10⁻¹³3 J, how many grays does the person receive?