Frequent Questions

What units does EPA use to report laboratory analysis results (drinking water, air filter and precipitation)?

EPA reports RadNet laboratory results in conventional units, as shown below with their international equivalents:


Conventional unit

International SI unit

Air Filter

Curie (Ci) per cubic meter (m3)

Becquerel (Bq) per cubic meter (m3)

Precipitation and drinking water

Curie (Ci) per liter (L)

Becquerel (Bq) per liter (L)


Results may be reported in any of the below prefixes:

1 attocurie = 10-18 Curies

1 picocurie = 10-12 Curies

1 nanocurie = 10-9 Curies

1 microcurie = 10-6 Curies

1 millicurie = 10-3 Curies

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