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(Forkortet) NGU has carried out new test measurements using av borehole gamma-ray spectrometer from IFG Corporation at different sites inthe North Charlotte Region. Improved calbrations of the instruments were made doing long term measurements on calibration pads at NGU. In situ calculations of K, U and Th content gave promising results as long as only one radionucleide was present. Calculating the K content in a situation where higher energy radiating elements were present, proved difficult.
In september, 1998, two helicopter geophysical survey were carried out over parts of Larvik and Porsgrunn municipalities. The purpose of the survey was to provide geophysical information to improve geological mapping in the area. A combined total of 3684 line-kilometres of VLF, radiometric, and magnetometric, and VLF data were collected in June, 1997, in a test area east from Larvik. The 1997 survey covered approximately 64 square km with a 100-m line spacing.
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