History of the sampling station at Grindsjön with Quarterly report on measurements of radionuclides in ground level air in Sweden. Fourth quarter 2003

Authors:

  • Söderström Catharina
  • Arntsing Rune
  • Jansson Peter
  • Lindh Karin
  • Wilhelmsen Katarina

Publish date: 2004-01-01

Report number: FOI-R--1262--SE

Pages: 14

Written in: English

Abstract

In December 2003 sampling of airborne radioactivity at the Grindsjön station was stopped. Sampling at the Grindsjön station has been done in different configurations since 1958. The station was reconfigured in 1971 to maximize sensitivity and the detection limits have been about a factor of three lower than for the other Swedish stations. Normal findings of Be-7 and Cs-137 are presented. Some special findings where the improved sensitivity has been useful are also presented. Filtering of ground level air is performed weekly at seven different locations in Sweden: Kiruna, Umeå, Gävle, Ursvik, Grindsjön, Visby and Ljungbyhed. The filters are pressed and the contents of different radionuclides are measured by gamma spectroscopy. Precipitation is also collected at four of the stations: Kiruna, Gävle, Ursvik and Ljungbyhed, the samples are ashed and the contents of radionuclides are measured. The levels of Be-7 and Cs-137 in air and precipitation are presented for the different stations. Other antropogenic radionuclides detected, if any are also presented.