With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Point Place is where a television sitcom takes place and it is unreal.
text_B: A delta ray is sometimes used to describe any recoil particle caused by secondary ionization .. ionization. ionization. The term was coined by J. J. Thomson .. J. J. Thomson. J. J. Thomson. A more modern definition is secondary electrons with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization . ''. ionization. ionization. Delta rays are entirely unrelated to the family of subatomic particles named delta baryon .. delta baryon. delta baryon
not_related.