42 K
19 23
Half life: 12.360 h 3
Jp: 2-
Decay mode: b-
Sn (keV): 7533.77 15
Sp (keV): 9243.0 7
Prod. mode: Fast neutron activation
Thermal neutron activation
Literature cut-off date: 1-Jun-1990
Author(s): P.M. Endt
ENSDF citation: NP A521,1 (1990)

Decay properties

Mode Branching (%) Q-value (keV)
b- 100 3525.4 3

Gammas from 42K (12.360 h 3)

Eg (keV) Ig (%) Decay mode
312.6 0.336 20 b-
586.87 <0.00038 b-
694.54 0.0033 7 b-
899.43 0.0515 25 b-
1022.78 0.0201 14 b-
1227.66 0.0024 11 b-
1524.70 18 b-
1922.18 0.041 4 b-
2424.09 0.020 3 b-

X-rays from 42K (12.360 h 3)

E (keV) I (%) Assignment
0,350 2.8E-07 7 Ca Lb1
0,412 1.3E-07 4 Ca Lb3
0,412 8.1E-08 24 Ca Lb4
3,600 1.69E-11 11 Ca Ka3
3,688 8.5E-05 5 Ca Ka2
3,692 1.70E-04 10 Ca Ka1
4,013 1.77E-05 10 Ca Kb1
4,013 9.0E-06 5 Ca Kb3

Betas from 42K (12.360 h 3)

>Eb endpoint (keV) Ib (%) Decay mode
78,44 0.07 1 b-
1101,23 0.05 1 b-
1688,1 0.34 3 b-
2000,67 17.64 9 b-
3525,4 81.90 9 b-