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[en] This paper presents a historical description of the implementation process of the Low Temperature thermochronology laboratory at the Colombian Geological Survey. The laboratory is focused on thermochronological dating of apatites and zircons with the fission track method. Here we explain the applied methodology, the results of the inter-calibration process performed in collaboration with the fission-track laboratory at ISTerre Joseph Fourier University and the internal inter-comparison of the SGC laboratory analysts. Furthermore, a viability study and irradiation conditions for fission track analysis in the nuclear reactor IAN-R1 is presented, in order to demonstrate the technical facilities, precision and reliability of the results obtained in the SGC laboratory to the scientific community.
[en] In this paper, the parameters thermal to epithermal neutron flux ratio (f) and thermal neutron flux (θth) are estimated (assuming α = 0) for the periphery irradiation positions (G3-G4) available at Nuclear Research Reactor IAN-R1 that belongs to the Colombian Geological Survey. This estimation was performed by measuring the induced activity, from neutron capture reactions (n, y) in two reference soils, which were irradiated (n = 4) together with Al-Au monitors. Four reference capture reactions were considered in soils, which involve isotopes of elements with certified mass fraction and 1/v behavior for cross section variation in the range of thermal neutron energy. An average value of 33 (CV = 9%) for f was found, considering 8 positions in the irradiation container; this value is comparable with measurements reported for periphery irradiation channels of TRIGA type reactors. The average thermal neutron flux determined for the 8 position of the container resulted in 1,5 *1011 ncm-2 s-1 (CV = 4 %).