Results:2 different decay possibilities were found


Dataset #1:

Author: Jun Chen   Citation:Nuclear Data Sheets 146, 1 (2017)

Parent
Nucleus
Parent
E(level)
Parent
Parent
T1/2
Decay Mode GS-GS Q-value
(keV)
Daughter
Nucleus
Decay
Scheme
 
ENSDF
file
 
138
57
La
 0.0    5+   1.03×10+11 y 1    ε: 65.5 4  1742   
138
56
Ba
 

Electrons:

Energy
(keV)
Intensity
(%)
Dose
( MeV/Bq-s )



Auger L     3.67      49.1 % 5   0.001800 17 
Auger K    26.4       4.16 % 17   0.00110 5 
CE K  1398.354 10        0.0485 %  6.78E-4

Gamma and X-ray radiation:

Energy
(keV)
Intensity
(%)
Dose
( MeV/Bq-s )



XR l     4.47       6.1 % 3   2.71E-4 13 
XR kα2    31.817      10.7 % 3   0.00339 9 
XR kα1    32.194      19.4 % 5   0.00626 16 
XR kβ3    36.304       1.86 % 5   6.76E-4 17 
XR kβ1    36.378       3.59 % 9   0.00131 3 
XR kβ2    37.255       1.14 % 3   4.24E-4 10 
  1435.795 10       65.5 %  0.940

Dataset #2:

Author: Jun Chen   Citation:Nuclear Data Sheets 146, 1 (2017)

Parent
Nucleus
Parent
E(level)
Parent
Parent
T1/2
Decay Mode GS-GS Q-value
(keV)
Daughter
Nucleus
Decay
Scheme
 
ENSDF
file
 
138
57
La
 0.0    5+   1.03×10+11 y 1    β-: 34.5 4  1052   
138
58
Ce
 

Beta-:

Energy
(keV)
End-point energy
(keV)
Intensity
(%)
Dose
( MeV/Bq-s )




    97.5 37    263 4     34.5 % 4   0.0336 13 

Mean beta- energy: 98 keV 4, total beta- intensity: 34.5 % 4, mean beta- dose: 0.0336 MeV/Bq-s 14

Electrons:

Energy
(keV)
Intensity
(%)
Dose
( MeV/Bq-s )



Auger L     3.94       0.0892 % 6   3.515E-6 24 
Auger K    28.4       0.0090 % 4   2.57E-6 11 
CE K   748.299 8        0.1004 %  7.51E-4
CE L   782.193 8        0.01401 %  1.096E-4
CE M   787.307 8        0.00294 %  2.31E-5
CE N   788.452 8        6.49E-4 %  5.11E-6
CE O   788.716 8        1.038E-4 %  8.19E-7

Gamma and X-ray radiation:

Energy
(keV)
Intensity
(%)
Dose
( MeV/Bq-s )



XR l     4.84       0.0127 % 5   6.17E-7 25 
XR kα2    34.279       0.0260 % 6   8.91E-6 21 
XR kα1    34.72       0.0472 % 11   1.64E-5 4 
XR kβ3    39.17       0.00459 % 10   1.80E-6 4 
XR kβ1    39.258       0.00886 % 20   3.48E-6 8 
XR kβ2    40.228       0.00285 % 6   1.147E-6 24 
   788.742 8       34.5 %  0.272