Up to 450 workers at Perth's new children's hospital have signed an "asbestos register" to monitor their future health and possibly lead to compensation in the wake of the discovery of the deadly material.

Asbestos was discovered last week in a roof panel installed in the incomplete $1.2 billion hospital, leading to the area being isolated. Construction union WA secretary Mick Buchan said affected workers felt shock and disbelief, including some who were showered in plumes of asbestos-riddled dust and had then gone home…