4
1 Introduction General Information on Technetium
Table 1.1 Properties of selected technetium radioisotopes (Browne 1986; Chu et al. 1999;
Kobayashi 1998; Maiti 2010; Nystrom and Thoennessen 2012)
Isotope Decay mode
Half-life
E
β
max /keV
(intensity in %)
Principal X or
gamma rays
energy/keV
(efficiency in %)
Generation
95 Tc
EC + β +
20.0 h
925.2 (93.8)
X: 17.37 (19.4);
17.48 (37.1)
γ: 765.8 (93.8)
nat. Zr( 7 Li,xn)
94,94 m,95,96 Tc
nat. Mo(p,xn)
94/98 Tc
95m Tc
EC (95.7)
IT (3.9)
β + (0.4)
61 d
690.6 (30.1)
943.7 (38.0)
1729.9 (13.3)
X: 17.37 (19.1);
17.48 (36.4)
γ: 204.1 (63.2);
511 ah (0.8);
582.1 (29.9);
835.1 (26.6);
96 Tc
EC + β +
4.28 d
217.8 (19.5)
532.2 (79)
X: 17.37 (19.2)
17.48 (36.6)
γ: 778.2 (100);
812.6 (82), 849.9
(98)
1126.9 (15.2)
96m Tc
IT (98.0)
EC + β + (2.0)
51.5 min
1028.8 (1.5)
X: 18.25 (9.5);
18.37 (18.1);
20.599 (1.5);
20.62 (2.8)
nat. Zr( 7 Li,xn)
94,94 m,95,96 Tc
97 Tc
EC
2.6 · 10 6 y
X: 17.4; 18.3;
19.6
97 Mo(d,2n)
97 Tc
97m Tc
IT (100)
EC (<0.34)
91 d
X: 18.25 (14.2);
18.37 (27.0);
20.60 (2.2);
20.62 (4.2)
γ: 96.5 (0.31)
96 Mo(d,n) 97m Tc
98 Tc
β −
4.2 · 10 6 y
398.2 (100)
γ: 652.4 (100);
745.4 (102.7);
98 Mo(p,n) 98 Tc
99 Tc
β −
2.11 · 10 5 y 293.7 (100)
X: 19.15
(0.0002)
γ: 89.65 (0.0006)
Fission,
99 Mo
99m Tc
IT (99.9963)
β − (0.0037)
6.01 h
346.7 (0.0026)
436.4 (0.0010)
X: 18.25 (2.15);
18.37 (4.10)
γ: 140.5 (89);
142.6 (0.019)
Fission,
99 Mo
100 Tc
β −
15.8 s
3202.4 (100)
γ: 539.5 (7);
590.8 (5.7);
Fission,
101 Tc
β −
14.22 min
1067.9 (6.4);
1306.1 (90.3)
γ: 306.9 (89);
545 (5.96);
Fission,
102 Tc
β −
5.28 s
4054.9(3.5)
4530 (92.9)
γ: 475.1 (7)
Fission,
1 Introduction General Information on Technetium
Table 1.1 Properties of selected technetium radioisotopes (Browne 1986; Chu et al. 1999;
Kobayashi 1998; Maiti 2010; Nystrom and Thoennessen 2012)
Isotope Decay mode
Half-life
E
β
max /keV
(intensity in %)
Principal X or
gamma rays
energy/keV
(efficiency in %)
Generation
95 Tc
EC + β +
20.0 h
925.2 (93.8)
X: 17.37 (19.4);
17.48 (37.1)
γ: 765.8 (93.8)
nat. Zr( 7 Li,xn)
94,94 m,95,96 Tc
nat. Mo(p,xn)
94/98 Tc
95m Tc
EC (95.7)
IT (3.9)
β + (0.4)
61 d
690.6 (30.1)
943.7 (38.0)
1729.9 (13.3)
X: 17.37 (19.1);
17.48 (36.4)
γ: 204.1 (63.2);
511 ah (0.8);
582.1 (29.9);
835.1 (26.6);
96 Tc
EC + β +
4.28 d
217.8 (19.5)
532.2 (79)
X: 17.37 (19.2)
17.48 (36.6)
γ: 778.2 (100);
812.6 (82), 849.9
(98)
1126.9 (15.2)
96m Tc
IT (98.0)
EC + β + (2.0)
51.5 min
1028.8 (1.5)
X: 18.25 (9.5);
18.37 (18.1);
20.599 (1.5);
20.62 (2.8)
nat. Zr( 7 Li,xn)
94,94 m,95,96 Tc
97 Tc
EC
2.6 · 10 6 y
X: 17.4; 18.3;
19.6
97 Mo(d,2n)
97 Tc
97m Tc
IT (100)
EC (<0.34)
91 d
X: 18.25 (14.2);
18.37 (27.0);
20.60 (2.2);
20.62 (4.2)
γ: 96.5 (0.31)
96 Mo(d,n) 97m Tc
98 Tc
β −
4.2 · 10 6 y
398.2 (100)
γ: 652.4 (100);
745.4 (102.7);
98 Mo(p,n) 98 Tc
99 Tc
β −
2.11 · 10 5 y 293.7 (100)
X: 19.15
(0.0002)
γ: 89.65 (0.0006)
Fission,
99 Mo
99m Tc
IT (99.9963)
β − (0.0037)
6.01 h
346.7 (0.0026)
436.4 (0.0010)
X: 18.25 (2.15);
18.37 (4.10)
γ: 140.5 (89);
142.6 (0.019)
Fission,
99 Mo
100 Tc
β −
15.8 s
3202.4 (100)
γ: 539.5 (7);
590.8 (5.7);
Fission,
101 Tc
β −
14.22 min
1067.9 (6.4);
1306.1 (90.3)
γ: 306.9 (89);
545 (5.96);
Fission,
102 Tc
β −
5.28 s
4054.9(3.5)
4530 (92.9)
γ: 475.1 (7)
Fission,