Changes

: [[Gamma-ray]]s are [[emit]]ted from the [[Atomic Nucleus|atomic nucleus]] of [[Unstable Isotope|unstable]] [[Radioactive|radioactive]] [[isotope]]s.

: [[Gamma-ray]]s cause [[electron]]s in [[material]]s to gain enough [[energy]] to leave [[atom]]s creating [[ion]]s which can destroy [[Chemical Bond|chemical bonds]].

: [[Gamma-ray]]s can penetrate most [[material]]s except for thick [[lead]] and thick sheets of other [[element]]s more [[dense]] than [[lead]] on the [[Periodic Table|periodic table]].

: [[Gamma-ray]]s cannot pass through heavy [[metal]]s ([[metal]]s with a high [[Atomic Mass|atomic mass]]).