can i say we can use one of these two hazard index parameters to assess the effect of Rn-222 inhalation and there is no need to calculate the two parameters.

Alpha Index measures the amount of alpha emitted by Ra-226 per second. In safe materials, its should be less than 1.

WHILE

Internal hazard index is a quantitative way of measuring the amount of radon and other short-lived products emitted by building materials inside a room. Internal hazard index is one of the causes of cancer. Its concentration in safe materials should be less that 1.

thank you so much professor.