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radiation. The second is the knowledge about how
much radiation is absorbed by substance or materials
within the surrounding air.

The strength of radiation is dependent on the ac-
tivity and energy of the source. Activity is a number of
nuclide that decay in a second. There is an associated
energy released during the decay process.The energy
can be in the form of photon or kinetic for wave type ra-
diation and particle type of radiation respectively. Two
units namely Curie and Becquerel shown in Equation
6.1 are defined to describe the activity of radioactive
materials.

1Curie ≡ 3.70 × 1010decay/s (6.1)
1Becquerel ≡ 1decay/s

Whenever the radiation is released into the sur-
rouding air, the air will receive some magnitude of ac-
tivity which is dependent on the total number of ra-
dioactive nuclei that have not yet undergone radioac-
tive decay at that moment in time and also on the half
life of radioactive materials as describe by Equation
6.2.

0.693 (6.2)
R = t1/2 No

As understand that decay is releasing radioactive
into environment so that the radiation can interact with
the substance or materials in the surrounding area.

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