1. SchoolDD.com
20
www.schoolDD.com
www.school

2. 20
Tips
( ) ( ) ( )
- F F F
- > >
- > >
- F > >
- > >
- (+2e) , (-1e) , (0)
Tips
p
n
F F
F F X A (= )
Z (= )
F F F =238.05u
F F +92e
( ) +2e F
( ) -1e F
( ) F F
(n) F F
(p) +1e F
F F www.schoolDD.com 1

3. Tips
F F F FF F F
FF
A= n=
A= t F
A0 = F (t = 0)
t= F
T1/2 =
- F F F F F
F , ,
- F F
Tips
F
A0 A A0 - A
- F F F A0
- F F F A
- F F A0-A
- F F F t
- F F F F F T1/2
- F T1/2 = = F = F F
Tips
( ) F F
F F F F , , F
F F
F F www.schoolDD.com 2

4. Tips
F
+
- F F
Tips
F
+ + 1.19 MeV + ( )
+ + + 17.3 MeV ( )
1. F F
2. + F F
- F F F
- F F
- F F
- F F
- F F F F F F
F
F
F F E = mc2 F
- 1 u = 1.66x10-27 Kg = 931 Mev
- 1 eV = 1.6x10-19 J
F F www.schoolDD.com 3

5. Tips
F
F
- F F F F F F F
-
- F F ( )
- F F F
- F
Tips
F
- F F F F
- F Co-60
- F F
- F I-131 F F
- F P-32 F F
- F C-14
- F Na-24
F F www.schoolDD.com 4

6. Tips
1. F F F F F
2. F F F F
3. F F F F
Tips
1. F F F F F F
2. F F F
3. F F F
4. F F F F
F F www.schoolDD.com 5