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We use the HB morphology of 48 Galactic GCs to study the radial distributionsof the different stellar populations known to exist in globular clusters.Assuming that the (extremely) blue HB stars correspond to stars enriched inHelium and light elements, we compare the radial distributions of starsselected according to colour on the HB to trace the distribution of thesecondary stellar populations in globular clusters. Unlike other cases, ourdata show that the populations are well mixed in 80% of the cases studied. Thisprovides some constraints on the mechanisms proposed to pollute theinterstellar medium in young globular clusters.

G2C2 - IV: A novel approach to study the radial distributions of multiple populations in Galactic globular clusters