How does a subatomic particle that has a mass propagate through the steel container of a bubble chamber? Wouldn't this require that the subatomic beam melt the steel enclosure of the bubble chamber and produce a hole so that the subatomic particle, that have a mass, can enter the bubble chamber that contains liquid hydrogen, therefore, creating a massive explosion. Doesn't the bubble chamber looks a lot like a hydrogen bomb. Did the hydrogen bomb physicsicts do tests to see if the radioactive isotope, used to create a hydrogen bomb, was stable in liquid hydrogen then discovered the bubble tracks? Did the particle physics insert an isotope within the bubble chamber to create the bubble tracks? Maybe.? Those sly little devils, you! Are there any old bubble chamber around? Wouldn't be hard to test for radioactive radiation. There would be trace amounts somewhere in the bubble chamber?