~— WHY FISHING BOATS WERE CONTAMINATED BY RADIATION (SU#KARY)* BY Dr. Eizo Tajima St. Faul's University Tokyo, Japan 1. Foreward: The major problem on the fisheries operations in the South Sea area is where and how fish and fishing boats were contaminated by radiation. 2. How Radiation Examinations Were Conducted: Examinations through the G-i! puage disclose that decks and other veshoble parts of a boat are weakly irrediated, while lanps and other unvcshable parts are strongly irradiated. The G-if guage can detect only the "beta" and "gamma" rays. The total volume of rays detected by the guage is averagely composed of 20 per cent of the "beta't ray and 60 per cent of the "gamma" ray. Certain directional relaticnships were often observable of fishing toats on the degrees of radiation of their stern, bow, larboard and starboard sides, It is discovered that the directions coincided with those of the seasonal winds which were blowing the boats. The Ne. 8 Junko sieru engeged in fisheries operations between 10 end i2 Gégrees of north latitude end between 173 and 170 degrees of west longi- tude in the period between April 15 end Mey h. It can be inferred thet the hydrogen bomb test which affected the boat was cerricd out in the period between the evening of May 3. and Kay 8. Degrees of nadiation: ~ Noire NX . ' se If the irrediated boats are clessified into those irradiated in the erea weSt of a spot where a hydrogen bond test was conducted (hereafter called these of "west area rediation") end those in the area east of the spot (hereafter calied those of "eest aree radiation"), of the "west area rediation" cetegory, thoseof which mre tran 1,000 counts per mimote nere detected will constitute 75 per cent, while such high counts were very rerely found of the "east area radiation" category. Tne average counts of the "west area radiation" category are registered at 123, while that of the “east erea radiation" category at 1,800. kh. Eest and West sree Radiation Categories: Of the "east saree radiation" category, according to Diersram e-a, the mocber cf counts show sudden rises on the dates when tests were carried cut & Frinted in SHIZEN, December, 195. lation. Exbessy Language Services Branch Trens-— “$o