Abstract
Within the framework of LOREX experiment the mineral Lorandite (TlAsS2) of the old (5 × 106 years) arsenic mine Allchar (Kavadarci, Macedonia) will be used to estimate average solar neutrino flux from the amounts of 205Pb isotope (T12=1.5 × 107 years) induced by 205Tl (ve, e-205Pb reaction. In order to evaluate the amount of the 205Pb isotope induced by 204Pb (n, γ) 205Pb reaction the thermal neutron flux inside and above the mine was measured by our high sensitive etched track neutron dosemeters (CR-39/BE, CR-39/BN-1). The thermal neutron flux was found to be (2.7 ± 0.4) × 10-3 cm-2 s-1. In addition to cosmic muon interactions and spontaneous fissions the neutrons can be produced through various (α, n) reactions due to the high alpha particle flux from the decay chains of uranium and thorium. Therefore radon concentration in the mine was measured by our diffusion chamber type dosemeter utilizing CR-39 detector and was found to be 1.5 × 104 Bq m-3. The possibilities to extend the application of etched track detectors to another solar neutrino experiments are discussed.
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