Metal complex of gallium Ga68 of formula Ch-L-B (chelate - linker - biovector), or Ch-Lp-Bq with p = q = 2 to 5, Ch being a chelate having the following general formula: in which: 1) B is a biovector for targeting a biological target associated with a pathological condition, said biovector being chosen from folate, metalloproteases, COX, tyrosine kinase, and cell receptors chosen from VEGF, KDR, CXC, LHRH, GPIIb/IIIa, bombesin/GRP, gastrin, VIP, CCK and GLUT, 2) L is a linker chosen from: a) P1-1-P2, with P1 and P2, which may be identical or different, chosen from O, S, NH, CO 2, -NHCO, CONH, NHCONH, NHCSNH, SO 2 NH-, and NHSO 2 -, and 1 represents an alkyl (advantageously C 1 -C 10), alkoxyalkyl (advantageously C 1 -C 10), polyalkoxyalkylene, alkyl interrupted with one or more squarates or with one more aryls, advantageously phenyl, alkenyl (advantageously C 2 -C 6), alkynyl (advantageously C 2 -C 6), alkyl interrupted with one or more groups chosen from -NH-, -O-, -CO-, -NH -, - NH-, -O -, or - O-; b) (CH 2) n, (CH 2) n -CO-, -(CH 2) n NH-CO- with n = 2 to 10, (CH 2 CH 2 O) q (CH 2) r -CO-, (CH 2 CH 2 O) q (CH 2) r -NH-CO- with q = 1-10 and r = 2-10, (CH 2) n -CONH-, (CH 2) n -CONH-PEG, (CH 2) n -NH-, with n = 1 to 5 and advantageously n = 4 or 5, HOOC-CH 2 -O(CH 2) 2 -O-(CH 2) 2 -O-CH 2 -COOH; HOOC-(CH 2) 2 -CO 2 -(CH 2) 2 -OCO-(CH 2) 2 -COOH; HOOC-CH -CH -COOH; HOOC-(CH 2) n -COOH; NH 2 -(CH 2) n -NH 2, with n = 0-20; NH 2 -(CH 2) n -CO 2 H; NH 2 -CH 2 -(CH 2 -O-CH 2) n -CO 2 H with n = 1 to 10. 1) B is a biovector for targeting a biological target associated with a pathological condition, said biovector being chosen from folate, metalloproteases, COX, tyrosine kinase, and cell receptors chosen from VEGF, KDR, CXC, LHRH, GPIIb/IIIa, bombesin/GRP, gastrin, VIP, CCK and GLUT, 2) L is a linker chosen from: a) P1-1-P2, with P1 and P2, which may be identical or different, chosen from O, S, NH, CO 2, -NHCO, CONH, NHCONH, NHCSNH, SO 2 NH-, and NHSO 2 -, and 1 represents an alkyl (advantageously C 1 -C 10), alkoxyalkyl (advantageously C 1 -C 10), polyalkoxyalkylene, alkyl interrupted with one or more squarates or with one more aryls, advantageously phenyl, alkenyl (advantageously C 2 -C 6), alkynyl (advantageously C 2 -C 6), alkyl interrupted with one or more groups chosen from -NH-, -O-, -CO-, -NH -, - NH-, -O -, or - O-; b) (CH 2) n, (CH 2) n -CO-, -(CH 2) n NH-CO- with n = 2 to 10, (CH 2 CH 2 O) q (CH 2) r -CO-, (CH 2 CH 2 O) q (CH 2) r -NH-CO- with q = 1-10 and r = 2-10, (CH 2) n -CONH-, (CH 2) n -CONH-PEG, (CH 2) n -NH-, with n = 1 to 5 and advantageously n = 4 or 5, HOOC-CH 2 -O(CH 2) 2 -O-(CH 2) 2 -O-CH 2 -COOH; HOOC-(CH 2) 2 -CO 2 -(CH 2) 2 -OCO-(CH 2) 2 -COOH; HOOC-CH -CH -COOH; HOOC-(CH 2) n -COOH; NH 2 -(CH 2) n -NH 2, with n = 0-20; NH 2 -(CH 2) n -CO 2 H; NH 2 -CH 2 -(CH 2 -O-CH 2) n -CO 2 H with n = 1 to 10. a) P1-1-P2, with P1 and P2, which may be identical or different, chosen from O, S, NH, CO 2, -NHCO, CONH, NHCONH, NHCSNH, SO 2 NH-, and NHSO 2 -, and 1 represents an alkyl (advantageously C 1 -C 10), alkoxyalkyl (advantageously C 1 -C 10), polyalkoxyalkylene, alkyl interrupted with one or more squarates or with one more aryls, advantageously phenyl, alkenyl (advantageously C 2 -C 6), alkynyl (advantageously C 2 -C 6), alkyl interrupted with one or more groups chosen from -NH-, -O-, -CO-, -NH -, - NH-, -O -, or - O-; b) (CH 2) n, (CH 2) n -CO-, -(CH 2) n NH-CO- with n = 2 to 10, (CH 2 CH 2 O) q (CH 2) r -CO-, (CH 2 CH 2 O) q (CH 2) r -NH-CO- with q = 1-10 and r = 2-10, (CH 2) n -CONH-, (CH 2) n -CONH-PEG, (CH 2) n -NH-, with n = 1 to 5 and advantageously n = 4 or 5, HOOC-CH 2 -O(CH 2) 2 -O-(CH 2) 2 -O-CH 2 -COOH; HOOC-(CH 2) 2 -CO 2 -(CH 2) 2 -OCO-(CH 2) 2 -COOH; HOOC-CH -CH -COOH; HOOC-(CH 2) n -COOH; NH 2 -(CH 2) n -NH 2, with n = 0-20; NH 2 -(CH 2) n -CO 2 H; NH 2 -CH 2 -(CH 2 -O-CH 2) n -CO 2 H with n = 1 to 10.