Pengaruh iradiasi sinar gamma terhadap aktivitas antioksidan, kadar fenolik total, dan kadar flavonoida total pada ekstrak etanol 70% herba suruhan (peperomia pellucida [l.] kunth) = The effect of gamma ray irradiation on the antioxidant activity total phenolic compound and total flavonoid in 70 ethanol extract of suruhan herb (peperomia pellucida (l.) kunth)