Sharp EL-5230 - Manual (Page 100)

98
DECAY :NORMAL
ORIGINAL MASS
Mº=?
T=
5719.980034
YEARS
Program code Key operations
T=-(ln(M≥©M≠))© ; T ; = S ( i
1.2118œ-4 ( @ v 1 z @
v 0 ) ) z 1.2118
` S 4 e
Print T i 0 ; T e
Print”YEARS i 1 @ a YEARS ;
e
End i 5 e
• The half-life of a radioactive isotope is the time required for half of its
mass to decay.
Running the program
4. Press j to return to the PROG mode menu.
5. Press 0, select the program
‘DECAY’ and press e.
6. Enter 100 for M 0 and 50 for M 1 .
Result
The half-life of 14 C is 5719.980034 years.
Chapter 8: Application Examples