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Mira Kossenko of the International Radiological Laboratory in Chelyabinsk has 40 years of medical records of 30,000 people exposed to strontium 90 from accidental dumping into the Techa River in 1956. These people had comparable exposures to the Hiroshima-Nagasaki survivors, on which we depend for much of our knowledge of radiation effects, but the rate of exposure corresponds more closely with civilian accidents. These records need to be on computer and analyzed.

JANUARY (pg. 131-135). FEBRUARY (pg. 135-139). MARCH (pg. 139-144). APRIL (pg. 144-149). MAY (pg. 149-153). JUNE (pg. 153-156). JULY (pg. 156-159). AUGUST (pg. 159-162). SEPTEMBER (pg. 162-167). OCTOBER (pg. 167-172). NOVEMBER (pg. 172-174). DECEMBER (pg. 174-178).

Your correspondents, Claudine Schneider and Jim Weiss, made some inaccurate statements in their letters (''Tainted Bait,'' Dec. 31). These errors presumably colored their views. It is indeed correct that nuclear power plants, such as the present commercial plants which contain uranium 238, produce plutonium. After a difficult chemical separation, the pure chemical element plutonium can be made. However, the fuel is left a long time in the reactor, and plutonium 240 is produced as well as plutonium 239, which cannot separated chemically. This makes a bomb difficult to make and unreliable because of pre-ignition.

Not only societies, but scientists too, must stand together in their support of international health-related efforts that are for the benefit of all people. ITSUZO SHIGEMATSU, M.D. Chairman, Exec. Board, Radiation Effects Research Foundation Hiroshima, Japan, Feb. 9, 1994