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More about α , β and γ Radiation. Nuclear Physics Lesson 3. Homework. Find out how they determined the nature of α , β and γ radiation. Learning Objectives. Recall what is meant by the term ionisation. Derive the inverse square law. Recall the equations for radioactive change.

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## More about α , β and γ Radiation

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**More about α, β and γ Radiation**Nuclear Physics Lesson 3**Homework**• Find out how they determined the nature of α, β and γ radiation.**Learning Objectives**Recall what is meant by the term ionisation. Derive the inverse square law. Recall the equations for radioactive change.**Inverse Square Law**The intensity, I, of the radiation is the radiation energy per second passing normally per unit area. (so intensity = energy per second/area) If a point source emits n photons per second, then the energy per second from the source is =nhf. The area radiated into is a sphere of radius r, where r is the distance from the source = 4πr2**Inverse Square Law**So the intensity, I of the radiation at this distance: This equation is often written in the form:- where k is a constant**Logarithms**100 = 102 In this statement we say that 10 is the base and 2 is the power or index. Logarithms provide an alternative way of writing a statement such as this. We rewrite it as log10 100 = 2 This is read as ‘log to the base 10 of 100 is 2’.**Logarithms**I like to think of logba as meaning “what power of b is a?” So log1010000 translates to:- “what power of 10 is 10,000?” =4 So log327 translates to:- “what power of 3 is 27?” =3**Another Example**25 = 32 we can write this as log2 32= 5 Here the base is 2 and the power is 5. We read this as ‘log to the base 2 of 32 is 5’.

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