In contemporary tokamaks

hydrogen isotope retention is evaluated by in-situ and post-mortem analyses.Mechanisms of the retention are implantation-trapping and co-deposition.Studies on hydrogen isotope retention at JT-60U

DIII-D

JET

ASDEX-U

C-MOD

TEXTOR and TORE SUPRA reveal that the nature of material

divertor geometry

structure and alignment of tiles

and temperature can affect the retention.This paper gives a review in this field of research at these tokamaks.The post-mortem plan at the EAST tokamak is briefed

too.