Fears of radiation exposure from normal use of such detectors are largely unfounded. identify reasons why 241am smoke detectors are perfectly safe. choose all that apply.

The reasons why  241am smoke detectors are perfectly safe is because;
(i)   The amount of americium is very little.
(ii)   The aluminium core is where the detector is hosted.
(iii)  The detector has a plastic cover.
(iv)   Radiation is limited in penetrating power.
(v)    There is a low number which is leaving the case.
(iv) ions get trapped by electrodes.

The answer would be b. it is a learned trait