The source of alpha particles in a smoke detector is the Americium.
Hey it isnt letting me submit my answer to your question on the Japanese chart, so imma just submit it here
The correct answer is B. on Apex!
The basic difference between thin layer chromatography (TLC) and paper chromatography (PC) is that, while the stationary phase in PC is paper, the stationary phase in TLC is a thin layer of an inert substance supported on a flat, unreactive surface. ... Paper chromatography is performed using paper.