me 83 such releases. Much work is also being done to design explosives which will product minimal amounts of tritium. Part F Question 17 How many curies are involved per 25 kiloton explosive? Or in a ko kiloton shot like RULISON? How can the environmental effects be considered unless we know? How can the benefit be compared with the risk? Part F Answer Question 17 Tritium and krypton-85 are the principal radioactive contaminants related to gas and oll recovery, and tritium is potentially the greater of the two. Approximately 40,000 curies of tritium and 350 curies of krypton-85 were produced by the 26 kiloton GASBUGGY explosion. The 40 kiloton RULISON explosion produced an estimated 10,000 curies of tritium and about 960 curies of krypton-85. Our exper lence with GASBUGGY has shown that only 5% of the tritium so produced remains in the gaseous phase to be diluted and swept to the surface by the uncontaminated natural gas flowing from the surrounding formation. Subsequent dilution of the gas by the flaring operation and atmospheric diffusion has resulted in barely detectable low concentrations of tritium (about 2.8 X 107}3 curies per cubic foot) at distances of only 1/2 mile from the site. Krypton-85 concentrations were not measured at these distances, since sensors closer to the site detected no krypton-85 concentrations above background. With this knowledge of concentrations, we are evaluating the effect of such levels of radionuclides on the environment and the resultant radiation dose to individuals. To compare the benefits and possible risks associated with the use of nuclearly stimulated natural gas one must also