WWW Table of Radioactive Isotopes
 
 
 
40K
1921

Half life: 1.277E+9 y 8  
Abundance: 0.0117 1 %
Jp:4-
Sn (keV): 7799.50 8
Sp (keV): 7582 5
Prod. mode: Naturally occurring
 
ENSDF citation:NP A521,1 (1990)
Literature cut-off date: 1-Jun-1990
Author(s): P.M. Endt
References since cut-off: 40K decay from 1990-98 (NSR)
 
Decay properties:
 
ModeBranching (%)Q-value (keV)   References        
b- 89.28 131311.09 12 90En08 
e+b+ 10.72 131504.9 3 86BrZQ  90En08 
 
Data sets:
 
Mode  Data set nameDisplay data
b-40K B- DECAY
Tables:  
ENSDF data:
Java applets:
e+b+40K EC DECAY
Tables:  
ENSDF data:
Java applets:


	
Gammas from 40K (1.277E+9 y 8)
Eg (keV)     Ig (%)    Decay mode

1460.830  11  e+b+ 


	

	
X-rays from 40K (1.277E+9 y 8)
E (keV)    I (%)    Assignment

0.251   0.0010 3   Ar Lb1
0.310   0.00028 10   Ar Lb4
0.310   0.00044 15   Ar Lb3
2.880   3.3E-08 4   Ar Ka3
2.955   0.31 3   Ar Ka2
2.957   0.62 6   Ar Ka1
3.190   0.025 3   Ar Kb3
3.190   0.049 5   Ar Kb1

	

	
Betas from 40K (1.277E+9 y 8)
Eb endpoint (keV)    Ib (%)    Decay mode

44.04  10.67 18 e 
482.9  0.00104 11 b+ 
1504.9  0.047 5 e 

	

Sort gammas by:   Eg,Ig   Ig,Eg   Decay mode,Eg

Sort alphas by:   Ea,Ia   Ia,Ea


Main page | Radiation search | Nuclide search