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The cross sections of the 169 Tm(α,γ) 173 Lu and 169 Tm(α,n) 172 Lu reactions have been measured first time using a new method, by detecting the characteristic X-ray radiation following the electron capture-decay of 172,173 Lu. Despite the relatively long half-life of the reaction products (T 1/2 = 500 and 6.7 days, respectively) it was possible to measure the cross section of the 169 Tm(α,γ) 173 Lu reaction close to the Gamow window (T 9 = 3.5 GK), between E c.m. = 13.16 and 17.08 MeV. The 169 Tm(α,n) 172 Lu reaction cross section was measured from E c.m. = 11.21 MeV up to E c.m. = 17.08 MeV. The experimental results have been compared to theoretical predictions.