Disintegration, Genetic Reconstruction

At the beginning, his skin started to dry up and his lips perched at the same time, his previously radiant skin was now cracking up as though they were made of porcelain glass as numerous tears appeared on his skin. 

But David's countenance remained the same. It was as though what had happened just now was of no surprise to him. Within the blink of an eye, the skin on his body was quickly repaired as he reverted back to its original form and his rosy shade of cheeks returned. 

He went forwards to the control button and tapped the adjustment bar. There, he saw the number 3000 rads and was slightly surprised. 

3000 rads were already doing fast damage to his body which meant that 3 times that amount might literally kill him. But David wasn't someone who was afraid at the slightest but difficulty.

Charging up the value to 7000 rads, David placed in the timer for one minute which gives him more time to make up his preparations.