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In the previous article, we saw that light attenuation obeys an exponential law.

Plotting t against F with a value of l=1 gives the graph on the right. The equivalent thickness for the medium in radiation attenuation is known as "half-value thickness".

Some of the others are roughly contemporary with Christ.

Let's take a look at an example of how dates are calculated using Libby's method.

The exponential decay formula is given by: $$m(t) = m_0 e^$$ where $\displaystyle r = \frac$, $h$ = half-life of Carbon-14 = 30$years,$m_0$is of the initial mass of the radioactive substance. So, we have:$\displaystyle r = \frac = \frac = 0.000121$The mass ratio of Carbon-14 to Carbon-12 is$\displaystyle m_0 = \frac\$ (just look this up).