Re:....."My doctor said that there is a minute possibility that i may loose a thumb nail due to the radiation hitting the nail bed."
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This would just be my opinion....but for a problem to happen with the nail the radiated area would have to go far down the finger to the DIP joint.

When you get RT the rest of the hand (non-radiated area) is well protected.

In my case, only on the index finger did the radiated area go down to the PIP joint....the rest of the RT was on the palm....I had no problems or side effects.

My thumb iss my most affected finger. Most of the rest of my Dups is in my palm. It had many nodules and cords running through. Not the most common way Dups attacks, but hey, that's the way Dups is. So far, my left hand shows some cords but not aggressive yet. In reality, each hand is different.
NA released the cords then I had RT on my whole palm including the first joints of the finger and a little farther up on the thumb, but not the next joint of my thumb