3 Kellogg, W. W., et al showing the large effect which the wind has in determining the character of the fallout. The meteorological problems associated with a fallout prediction are discussed. Aisura, Kenjiro ANALYSIS OF RADIOACTIVE FALLOUT OF THE ATOMIC BOMB EXPLOS TON ON BIKINI. 19%). Badioisetopes (Japan) 3, 1 The radioactive fallout was found to contain 55.2, 7. 0, ll. 8, and 26. of of. CaO, MgO, rope respectively, the chief constituent and Hea being Ca(0H)2. The electric-spark method of analysis showed the presence of Al, Fe, and Si in addition Ca and hg. Its decay curve followed I= ct~1-37, where I represents radioactivity, t, time since the explosion took place, March 1, 1954, and c, const. 0aoeeSee Its specific activity measured on April 23, 195%, was 0.37 me. (6.Bette=55gtgeD> §gidengified bE 26we e $35, ba58 » and Pr739! Kimura, Kenjiro INTRODUCTION TO SPECIAL COLLECTION OF PAPERS. (ges OF THE BIKINI ASH. JapanAnalyst 3, 333+ The incident of the Bikini ashes and the fishing boat is reported. Experiences on the boat are recorded, and fallout analyses are compared with those of Nagasaki and Hiroshima.