Valuation of Normal loss

Hey folks,

i have a doubt in cost accounts. In process costing how do we value the normal loss. In the instute material its told that the cost of normal loss will be fully absorbed by the good materials. thus there need not be any amount to be credited in the process a/c as it gets automatically got absorbed in the cost of output transferred to the next process. But in some reference books i saw that the normal loss have to be credited with its scrap value. I dont understand which one to follow..

Wats the meaning of scrap value?? is it the realisable value of the that quantity??? or the residual value of that quantity arrived by Cost - realisable value??

Thanks in advance