1.

""^(18)F undergoes 90% decay in 365 min. The decay constant for ""^(18)F is :

Answer»

`6.31xx10^(-3)MIN""^(-1)`
`7.32xx10^(-3)min""^(-1)`
`6.31xx10^(-4)min""^(-1)`
`6.31xx10^(-2)min`

Solution :`lamda=(2.303)/(365)LOG""(100)/(10)`
`=(2.303)/(366)xx1=6.31xx10^(-3)min""^(-1)`


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