# The rad is the correct unit used to report the measurement of Option 1) the rate of decay of radioactive source Option 2) the ability of a beam of gamma ray photons to produce ions in a target Option 3) the energy delivered by radiation to target Option 4) the biological effect of radiation.

As we learnt in

γ decay -

$\gamma$ ray emitted when nucleus undergoes radio active decay left it in excited state

- wherein

After emission of $\alpha ,\beta$  particle the product nucleus formed in excited state

Correct option is 4.

Option 1)

the rate of decay of radioactive source

This is an incorrect option.

Option 2)

the ability of a beam of gamma ray photons to produce ions in a target

This is an incorrect option.

Option 3)

the energy delivered by radiation to target

This is an incorrect option.

Option 4)

This is the correct option.

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