A transuranic component of atomic quantity 104, expression Ku; also referred to as rutherfordium, expression Rf. It is stated in very small amounts by atomic responses. In November 1993 the nomenclature committe of the United states Chemical Society approved title rutherfordium for element 104. Russsian investigators who claim having initially discovered element 104, isotope 260 (half-life 0.3 seconds) in 1964 at Dubna proposed title kurchatovium. But detectives at Berkely in 1969 produced a number of isotopes of element 104 but were not able to produce isotope 260; they reported finding isotope 257, with a half-life of 4-5 seconds, isotope 259 with a half-life of 3-4 moments, and isotope 258 with a shorter half-life.