Is evidence of a juvenile adjudication in aggravation a factor in a criminal conviction?

Defendant argues that evidence of juvenile adjudications is inadmissible at the penalty phase of trial because a juvenile adjudication is neither a "prior felony conviction" within the express terms of section 190.3, factor (c), nor "criminal activity" involving violence within the terms of factor (b). He again relies on People v. Boyd, supra, 38 Cal.3d 762, 772-776, 215 Cal.Rptr. 1, 700 P.2d 782, and its rule that evidence not relevant to a listed factor in aggravation is inadmissible.