[en] Just after the nuclear accident at Chernobyl in USSR, a special program on radiological examination was put into execution by National Institute of Radiological Sciences (NIRS) for 118 airplane passengers come from the contaminated area around Chernobyl. They were suspected to have been exposed and to have been contaminated during stay in Kiev near Chernobyl on April 30 and May 1, 1986, judging from the reported meteorological information. Upon their arrival at Tokyo International Airport, radiological examination was made against their clothes, baggages and hairs. Radioactivities ranging 1000∼10000 cpm were detected from about a half of the passengers by GM survey meter. Decontaminations against fifteen's hair were made at Radiation Emergency Handling suite of NIRS. Thyroid burdens of I-131 were measured with NaI(Tl) scintillation type whole body counter, and the maximum burden was 2.2 x 10³ Bq. Absorbed dose of β-ray was also measured with a thermoluminescent detector using contaminated clothes in order to estimate the shallow dose equivalent. The maximum dose for skin was estimated to be 0.02 Gy. This dose level was not considered to be radiologically significant, and it was concluded that the contamination has no effect on health of the passengers. (author)