Various, The Strand Magazine, Vol. 27, January 1904…
“ Inside the tube I could see a white powder."Why is the tube wrapped with lead?" I inquired."For the protection of those who handle it. Lead stops the harmful rays, that would otherwise make trouble.""Trouble?""Yes; you see the radium in this tube is very active; it has an intensity of 1,500,000, and if I were to lay it against your hand or any part of your body, so"—he touched my hand with the bare tube—"and if I were to leave it there for a few minutes, you would certainly hear from it later." ”
