Avaruuskansiot säteily

https://www.youtube.com/watch?v=k3rKntGwN-8

Tulitikun sytytys

https://www.youtube.com/watch?v=T_Rt93fvZls

Types of radiation

https://www.youtube.com/watch?v=5oUagoF_viQ

What is alpha radiation

https://www.youtube.com/watch?v=j5TJRtJxVfs