Decay Nuclear fission product

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the external gamma dose person in open near chernobyl disaster site.



the portion of total radiation dose (in air) contributed each isotope versus time after chernobyl disaster, @ site thereof. note image drawn using data oecd report, , second edition of radiochemical manual .


for fission of uranium-235, predominant radioactive fission products include isotopes of iodine, caesium, strontium, xenon , barium. threat becomes smaller passage of time. locations radiation fields once posed immediate mortal threats, such of chernobyl nuclear power plant on day 1 of accident , ground 0 sites of u.s. atomic bombings in japan (6 hours after detonation) relatively safe because radioactivity has decayed low level. many of fission products decay through short-lived isotopes form stable isotopes, considerable number of radioisotopes have half-lives longer day.


the radioactivity in fission product mixture caused short lived isotopes such iodine-131 , ba; after 4 months ce, zr/nb , sr take largest share, while after 2 or 3 years largest share taken ce/pr, ru/rh , pm. later sr , cs main radioisotopes, being succeeded tc. in case of release of radioactivity power reactor or used fuel, elements released; result, isotopic signature of radioactivity different open air nuclear detonation, fission products dispersed.








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