[en] Nuclear techniques for the detection of trace element quantities of ⁹Be in environmental and biological samples have been investigated. A literature search has been made for suitable nuclear reactions using p, d, α, n and photons as incoming particles. The reactions ⁹Be(p,αγ)⁶Li, ⁹Be(d,nγ)¹⁰Be, ⁹Be(α,nγ)¹²C and ⁹Be(γ,n)⁸Be seems to be usable for ⁹Be concentrations in the order of ppm. Experimentally, the possibility ⁹Be(p,αγ)⁶Li has been tested at the resonance which occurs for Esub(p) = 2.567 MeV with a width of 39 keV and a cross-section of 110 mb. A Ge(Li) detector was used to detect the gamma-ray of energy 2.561 MeV for ⁶Li. Although the detection limit does not seem to be below 1 ppm for this reaction, it might be useful to establish an upper limit for the ⁹Be concentration in the range 1-20 ppm during conventional PIXE analyses just be monitoring the 3₅61 MeV gamma-ray in a suitable detector. (M.L.)