Table 3.

Corrected exposure rate estimates at the outer corridor

Parameters used for estimate of radiation level

Effective half life of clearance for cancer thyroid (stop thyroxin patients) T½eff=16.5 h (Ravichandran et al.[7])

Patient’s occupancy in the isolation room=3 days=72 h

Activity at the time of release as per effective decay = A × exp (−0.693×72/16.5)=0.0486.A

=5% of initial activity A

Therefore, the effective activity for exposure rate=(53%) × 1.48 µSv/h=0.74 µSv/h