The preparation of radioactive 10Be, 37Ar and 39Ar samples is discussed. Investigation of the 10Be(nth,γ)11Be , 37Ar(nth,α)34S , 37Ar(nth , p)37Cl and 39Ar(nth,α)36S reactions is reported, and resonances in the 37Ar(n , α)34S reaction have been observed and analysed