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Environmental Radiation Situation

Regular on-site radiological measurements in NRIRR

The NRIRR performs regular radiological on-site measurements to characterize the environmental radiation situation more than 20 years. Recently, the measurements are performed by the Division of Environmental and Public Radiohygiene of NRIRR. The summary of results has been published weekly, via web, since 2002.

Gross-beta activity of aerosols (measured after sampling by 72h)

dateactivity concentration
mBq/m3
2007.03.19n/a
2007.03.202.0
2007.03.21n/a
2007.03.22n/a
2007.03.230.6
2007.03.24n/a
2007.03.25n/a
Minimum and maximum
in the last year		< 0,5 - 5,5

Deposition from the air (fall-out)

datesurface activity concentration
mBq/m2/month
gross-beta137Cs
2007.01.3.76< 0.4
minimum of last year2.3< 0.12
maximum of last year24.5< 0.45

Environmental gamma dose rate

periodgamma dose rate
nSv/h
minimummaximum
2007.03.26 - 03.309198
Previous measurements90103

Surface activity of soil by in-situ gamma spectrometry

date137Cs
surface activity
kBq/m2
2002.08.02.2.9
Previous measurements1.76

Time course of gross-beta activity of aerosols

Time course of fall-out activity

Time course of the environmental gamma dose rate

WARNING! Data measured after 2002 are expressed as ambient dose equivalent rate (red columns) instead of absorbed dose rate (blue columns). For this reason values are greater by about 17% than before.

Revision: 10-04-2007