cesium, tritium, chromium, radioactivity, arsenic, barium, iodine, caesium, radium, apatite, radioactive, selenium, contaminant, mercury, radioactive decay, americium, krypton, isotopic, pentachlorophenol, radionuclide, radiocarbon, arsenate, perchlorates, tremolite, acrolein, radioactive material, concretions, sulfate, dieldrin, thorium, neutron radiation, antineutrinos, manganese, calcium, chlordane, cadmium, nuclides, selenite, ionizing radiation, sediment, carbon tetrachloride, silicate, ammonium, californium, praseodymium, curies, chloride, heptachlor, organochlorine, pyroxene, nitrate, aragonite, magnesium hydroxide, amphipods, thallium, dioxane, tetroxide, urate, cyanides, diatom, sarcosine, biphenyl, fluoride, calcium fluoride, tetrachlorethylene, microgram, endrin, sodium fluoride, methyl chloride, phs, benzene, plagioclase, phosphorus, olivine, cobalamin, putrescine, fissionable, monazite, methylmercury, concentrations, beryllium, cerium, phosphorous, toxaphene, naturally occurring, radon, carbon disulfide, hydroxides, magmas, radiation, berkelium, hydroxyl radical, toxins, potassium carbonate, orthophosphate, arsenide, formate, conodonts, iodide, sulphate, sodium iodide, trichloroethane, magnesium, uranium, vanadium, cobalt, potassium, sulfur, antimony, bismuth, chlorine, fluorine, lithium, cupric, ferrous, ferric, sr, sodium, nd, chromic, cuprous, hydrogen, mercuric, pb

strontium 90

alkaline-earth metal, alkaline earth, celestite, red fire, rubidium-strontium dating, strontianite, strontium 90

metal, metallic element

atomic number 38