Objective: To determine and investigate the half life of thoron

The decay process of radioactive materials can be described by an exponential law. The equation is:

Where Lf is the decay constant for the individual nuclei.

N0 is the number of unstable nuclei at time t=0.

Every radioactive nucleus has a definite time interval T1/2. That is the half-life. It is the number of unstable nuclei decreasing to half of original number. After the T1/2 ,

the number of nuclei reduces half and half.

In the experiment, a thoron-air mixture is blown into an ionization chamber subject to a saturation voltage. Alpha-decay o

f the thorium emanation cause ion formation. This produce a current, whose ternporal progression is recorded with TY-recorder or oscilloscope. The current is the measure of the number of decays per time interval, and thus the recorded graph represents a decay curve.

The half life found in the experiment was (56.79Ó0.64)s. The result was near to actual half life of thoron. This was because the error sources contained during experiment.

Some common words found in the essay are:
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Approximate Word count = 536
Approximate Pages = 2 (250 words per page double spaced)