Study of radial distribution of 239,240Pu and 90Sr in annual tree rings and trunk bark of a 103 years old Norway spruce at four different heights above ground

Abstract

Radial distribution of 239,240Pu and 90Sr originating from atmospheric nuclear tests in tree rings and trunk bark at heights of 1.3, 10, 18 and 22 m above ground was studied. 239,240Pu activity concentrations in air dried tree ring samples (each containing 10 annual rings) at all heights were under detection limit of the used method. 90Sr activity concentrations in tree ring samples ranged from 0.54 to 2.81 Bq kg−1. 239,240Pu and 90Sr were present in the trunk bark. The paper presents data for 239,240Pu and 90Sr aggregated transfer factors to tree trunk.