137CS B- DECAY 
Parent state: G.S.
Half life: 30.04 Y(3)
Q(gs): 1175.63(17) keV
Branch ratio:        1.0    
Beta ray: 

    Max.E(keV)    Avg.E(keV)     Intensity(rel)  Spin    7/2+
      1176( 1)   416.264(72)       5.6( 2)               3/2+
     892.1( -)   300.570(68)    5.8E-4( 8)               1/2+
    514.03(23)   174.320(61)      94.4( 2)              11/2-

Gamma ray: 
   Energy(keV)    Intensity(rel)
     283.5( 1)    5.8E-4( 8)
   661.657( 3)      85.1( 2)
J. K. TULI, Nuclear Data Sheet 81, 579 (1997)

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