Continous monitoring of gammanuclides, strontium (beta) and tritium in deposition in Finnish Lapland

Updated 2013-01-26

Part of the continuous nationwide monitoring of radionuclides in Finland. The dose rate monitoring network in Finnish Lapland comprise 32 automatic measurement stations (Finnish nation-wide monitoring network consists of about 257 stations equipped with GM tubes). Three of the stations are equipped with LaBr3-detectors measuring a gammaspectrum with 10 minute intervals. The network is intended for civilian defence and surveillance purposes, not for research. It is a good early warning system in radiation fallout situation. Every monitoring station have individual alarm level: 7 days average dose rate + 0.1 microSv/h. The dense network indicate also the extent of the radioactive contamination.

This is a National Implementation Plan (NIP) project
Comments and additional information:

Tritium 3H is collected only in Apukka, Rovaniemi rural commune.

Time frame

Status
Ongoing
Project time span
1960 -
Data collection
1960 -
Data processing
1960 -
Data reporting
1960 - 1999

Contact information

Contact person
Kaj Vesterbacka
Address
STUK - Radiation and Nuclear Safety Authority PL 14, 00881 Helsinki Finland
Phone
+358 (0)9 7598 8426
Fax
+358 (0)9 7598 8433
Email
if.kuts@akcabretsev.jak
Other project contacts
Other project contacts: Dina Solatie STUK - Radiation and Nuclear safety Authority Regional laboratory in Northern Finland Lähteentie 2 FIN-96400 Rovaniemi Finland

Parameters and Media

Parameter groups measured/observed/modelled
Radionuclides
Media sampled/studied/modelled
Precipitation/snow
Additional information or further specification of types of data / information collected, species / tissues / organs sampled, etc.

Precipitation sampling is performed using specially designed collectors made of stainless steel with a surface area of 0.07 m2. The deposition samplers do not separate wet or dry deposition, they are collected together. There is a light heating resistor inside the funnel to melt snow and ice gathered to the funnel to make the sampling more reliable in winter time. The sampling period is one month. Tritium samples are collected daily in a collector with a surface area 0.05 m2. The daily samples of one month are pooled and a 2 litre aliquot with a list of the daily precipitation is sent to STUK/Helsinki for analysis.

Geography

Regions studied
Fennoscandia
Finland
Lapland
Scandinavia
Stations or areas where observations are made

The stations cover all municipalities in Lapland.

Data availability

Are data archived or planned to be archived at an AMAP Thematic Data Centre?
yes-partly
Data centres
Atmospheric TDC
Radioactivity TDC
If no (or only part of data are reported to a TDC), where and how are (other) data stored?
The data is archived in STUK’s database. The data is available on request from the project leader.
References to key publications (or planned publications) and data reports
The results are published in annual research reports in STUK’s research report series B. STUK - B -TKO, May 2000. Surveillance of environmental radiation in Finland . Annual report 1999. Raimo Mustonen (Ed.) p.33-34. STUK-B 148/August 2011, Surveillance of Environmental Radiation in Finland. Annual Report 2011. Raimo Mustonen (ed).
Samples/specimens archived in specimen banks?
No

Methods & Procedures

Procedures and methodology used for, e.g., sampling and sample storage, sample pretreatment, extraction and analysis, including which laboratories are involved, references to methods employed, etc.

Known amounts of Sr, Cs, Ba and Ce carriers are added to the samples, which have already been acidified with nitric acid during the collection of the precipitation. The samples are concentrated by evaporation and ashing and thereafter analysed for gammaemitting radionuclides with gamma spectrometers. Measurement time >64 h. 90Sr is separated radiochemically either using the traditional fumic nitric acid method or with an ionchromatographic method. Thereafter 90Sr is determined via its daughter nuclide 90Y with alow background proportional beta counter. Tritium 3H distillation to dryness and electrolytic enrichment, determination using liquid scintillation counting.

QA/QC Information (what QA/QC procedures are implemented, laboratories involvment in QA/QC activities, model verification/validation routines, etc.)

Intercomparison IAEA and EPA. STUK is accreditated for gammaspectrometric measurements and 90Sr analyses (FINAS).

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
No
Is this project reporting to other organizations/programmes?

STUK reports doserate measurement information to European Comission under the article 35. STUK also reports doserate information to other Baltic Sea states.

Other related projects

Airborne radionuclides

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