system
Given the following post, respond as if you're commenting on Reddit:
human
How does radiation make other objects radioactive?

And is it always happen regardless of dosage?
gpt
The primary way that ionizing radiation makes things radioactive is by inducing nuclear reactions in the material, and transmuting its nuclei into different, radioactive species.

This is primarily only a concern with neutron radiation, although very high-intensity, high-energy charged particles or gamma rays can activate things too.

>And is it always happen regardless of dosage?

The total amount of induced radioactivity will be proportional to the dose. At small doses, the induced radioactivity will be small but nonzero.