Granite and marble do emit tiny but noticeable amount of radiation in different proportions.
The radioactivity of marble.
Many homes contain decorative rock and stone such as granite and marble.
By curiouspost august 23 2015.
However some articles have circulated that claim granite is a source of harmful radiation specifically radon.
These range from natural materials such as wood marble and granite to engineered products such as quartz stone.
The amount of radioactivity in building materials depends on the type of material but the amount of radiation released from these materials is typically very very low.
Yes it is true.
These marbles barely register on sensitive geiger counters and the radiation emitted barely creeps above the background radiation we experience everyday from natural sources.
Generally these substances contain traces of radioactive elements like uranium thorium and their daughter products like radium polonium and radon.
Although the marbles emit beta particles and gamma rays which are dangerous at high levels they only give off a small number of these radioactive decay products.