Boletim Epidemiológico resumido 2017: radioacidente Césio 137 - 30 anos / Summary Epidemiological Bulletin 2017: Cesium 137 radio accident - 30 years

O Boletim Epidemiológico resumido constitui um instrumento de informação objetivo, com dados sobre a mortalidade e a incidência cumulativa de transtornos de saúde sofridos pelos radioacidentados dos grupos I e II e seus filhos, desde o acidente radiológico, ocorrido em 27 de setembro de 1987, até 31 de julho de 2017, perfazendo quase 30 anos. Para o grupo III, as informações são relativas ao período de cinco anos, de agosto de 2012 a julho de 2017. Também há uma descrição dos atendimentos prestados pela Superintendência Leide das Neves (SULEIDE) e pelo Centro de Assistência aos Radioacidentados (CARA), por especialidade, desde 2008.

The summary Epidemiological Bulletin is an objective information tool, with data on mortality and the cumulative incidence of health disorders suffered by radio accident victims in groups I and II and their children, since the radiological accident, which occurred on September 27, 1987, until July 31, 2017, making it almost 30 years old. For group III, the information is related to the five-year period, from August 2012 to July 2017. There is also a description of the services provided by the Leide das Neves Superintendence (SULEIDE) and by the Assistance Center for Radio Injuries (CARA), by specialty, since 2008.

Temporal variation of 137Cs water column inventory in the North Pacific since the 1960s.

The temporal variation of water column inventories of 137Cs in the North Pacific since the 1960s was examined based on the analysis of the 137Cs profiles in HAM database. 137Cs in seawater in the North Pacific have originated mainly from global fallout from atmospheric nuclear weapons tests, which occurred in the early 1960s. In the 1960s, both the meridional distribution of 137Cs inventory in the North Pacific and that of fallout on land stations showed mid-latitude maximum. The region with higher deposition at land stations, however, was more northern than the latitudes where the 137Cs inventory in the North Pacific showed a maximum. The difference of the latitude where maximum 137Cs deposition/inventory was observed reflects the difference of the geographical distribution of the precipitation amount in the Pacific and Atlantic Oceans followed by the different warm current systems in each ocean. A good positive relation between 137Cs inventory and annual precipitation amount was discovered in the ocean stations at the middle latitude in the North Pacific. The horizontal distribution of 137Cs inventories at the middle latitudes in the North Pacific is characterized as west-high and east-low in the early 1960s, which was basically controlled by the distribution of annual precipitation amount. Eastward advection, then, modified it to be less difference in 1966-1967 after the highest deposition periods in 1963-1965. In the 1970s and 1980s, increases of the 137Cs inventory at the lower latitude of 10-20 deg. N are found. Surface and subsurface southward transports are considered as the source of this increasing 137Cs inventory.