Unfolding of polonium distribution in depth of irradiated lead-bismuth eutectic from alpha-particle pulse-height distribution.

The alpha-particle pulse-height distribution measured from irradiated LBE is determined from the polonium distribution in it. The unfolding of vertical polonium distribution in irradiated LBE ingot is performed with the unfolding code UFOQ. The code uses quadratic programming to consider the constraint that polonium distribution does not have negative values.