How do you filter potassium-40 from a banana?

[fredreload]

I want a stable source of gamma ray so I intend to filter out isotopes from a banana, how can I achieve that? I am a newbie at isotope filtering.

[Strange]

2 hours ago, fredreload said:

I want a stable source of gamma ray so I intend to filter out isotopes from a banana, how can I achieve that? I am a newbie at isotope filtering.

A banana contains about half a gram of potation, of which about 0.012% is K40. So this is not a great way of way of trying to obtain a source of gamma rays.

There are far easier ways of getting a source of radiation.

!

Moderator Note

Which, obviously, we are not going to tell you.