20
-149 - . sSm = 40800 , 1/2Sm = 13.84 , . , ?
, - , , , -149 . , , , , , , , , , , . , -, , -149 , .
20.1. - 149Sm
149Sm ( gSm <10-5). 149Sm b- - -149 (149Pm). ( : gPm 10-4), b- -149 (149Nd) - (gNd = 0.011). , , .20.1.
(n,f) g < 10-4 (b) s = 40800
235U + 1n 149Pm* 149Sm + 1n 150Nd (sa 3 )
gNd= 0.011 b T1/2= 54
149Nd* 1/2=2.3
20.1. -149
-149:
) -149 (gPm < 10-4), .
) , -149 -149, , , , -149 , -149.
, , :
(n, f) (b) (n, g)
235U + on1 ______________> 149Pm* _____________ > 149Sm _________________> 150Nd
g = 0.011 T1/2 = 54 sa = 40800
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-149 :
(20.1.1)
, (20.1) - (NPm(t) NSm(t)), , , -149:
(20.1.2)
, (t) = idem = , .