Air samples are normally collected on a weekly basis and it
remained so throughout the study period. However, four additional
air sampling pumps were deployed after the Fukushima event.
These supplemental air sampling pumps were co-located with four
of the existing stations. The co-locations were at 0S2, 8S1, 7D1 and
5F1. In addition, the four supplemental air sampling pumps were
deployed with an increased flow rate of 3.40 m3/hr. Normally they
are set with a flow rate of 2.55 m3/hr.