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→Calculating Half Life
| style="height:20px; width:300px; text-align:center;" |'''1. Identify how many times the [[Count Rate|count rate]] has halved.'''
<math>200 \div ÷ 2 = 100</math>
<math>100 \div ÷ 2 = 50</math>
<math>50 \div ÷ 2 = 25</math>
The [[Count Rate|count rate]] has halved 3 times.
| style="height:20px; width:300px; text-align:center;" |'''1. Identify how many times the number of [[Unstable Isotope|unstable]] [[atom]]s has halved.'''
<math>224 \div ÷ 2 = 112</math>
<math>112 \div ÷ 2 = 56</math>
<math>56 \div ÷ 2 = 28</math>
<math>56 \div ÷ 2 = 28</math>
The number of [[Unstable Isotope|unstable]] [[atom]]s has halved 4 times.
| style="height:20px; width:300px; text-align:center;" |'''2. Divide the time taken by the number of times the [[Count Rate|count rate]] has halved.'''
<math>90 \div ÷ 3 = 30</math>
'''Half Life''' = 30 days.
| style="height:20px; width:300px; text-align:center;" |'''2. Divide the time taken by the number of times the number of [[Unstable Isotope|unstable]] [[atom]]s has halved.'''
<math>18 \div ÷ 4 = 4.5</math>
'''Half Life''' = 4.5 [[minute]]s