# UNPLANNED AIRBORNE RELEASE OF ACTIVITY CRITERIA FOR FACILITIES

To summarize the four levels of release criteria for facilities, five well known examples are provided:

radiologically equivalent to the order of more than tens of thousands of TBq of ^{131}I

( > 50 000 TBq ^{131}I)

Chernobyl

Fukushima

radiologically equivalent to the order of thousands to tens of thousands of TBq of ^{131}I

( > 5 000 TBq ^{131}I)

Kyshtym

radiologically equivalent to the order of hundreds to thousands of TBq of ^{131}I

( > 500 TBq ^{131}I)

Windscale

radiologically equivalent to the order of tens to hundreds of TBq of ^{131}I

( > 50 TBq ^{131}I)

Tokaimura

Kyshtym

Sept. 1957

Windscale

Oct. 1957

Chernobyl

Apr. 1986

Tokaimura

Sept. 1999

Fukushima

Mar. 2011