[en] Neutron-deficient isotopes of radium have been produced in the reactions ³⁵Cl+¹⁷⁵Lu, ⁴⁰Ar+^170,171Yb, and ³⁶Ar+^170,171Yb and separated in-flight with a gas-filled recoil separator. The activities have been identified on the basis of correlated alpha decay chains. The alpha particle energy E_α and the half-life T_1/2 of an isomeric state of the new isotope, ^203mRa, have been determined to be (7615±20) keV and (33⁺²²_-10) ms, respectively. An assignment of another decay with E_α=(7577±20) keV and T_1/2=(1.1^+5.0_-0.5) ms to ^203gRa is made on the basis of one observed three-decay chain. Tentative evidence for the production of the new isotope ²⁰²Ra is also given. The values E_α=(7860±60) keV and T_1/2=(0.7^+3.3_-0.3) ms were measured. Improved decay data have been obtained for ²⁰⁴Ra. The results are E_α=(7484±10) keV and T_1/2=(59⁺¹²_-9) ms. Earlier findings concerning the decay of two states in ²⁰⁵Ra and an isomer in ²⁰⁷Ra have been confirmed. Approximate values for cross sections have been determined for ²⁰²Ra, produced using the ³⁶Ar+¹⁷⁰Yb reaction and for ²⁰³Ra, ²⁰⁴Ra, and ²⁰⁵Ra using the ³⁵Cl+¹⁷⁵Lu reaction. The results are 2 nb (²⁰²Ra), 4 nb (²⁰³Ra), 40 nb (²⁰⁴Ra), and 800 nb (²⁰⁵Ra). (orig.)