Field measurements of thorium and uranium in lujavrites from the Ilímaussaq intrusion

During last summer 3388 field measurements of the thorium and uranium content of the lujavrites from the Ilimaussaq intrusion were carried out with a portable spectrometer (Løvborg, 1967; Løvborg et al. 1968; Løvborg et al. in press) consisting of a seintillation detector and a single-channel pulse-height analyser. Within selected small areas measurements were made at the joints of a 1m grid.