Nuclear disaster spread radioisotopes greatly to the environment. The isotopes fall on the surface earth, radiate and pollute the environment. So dosimetric data for estimating the accident is necessary. For this reason, the ORNL phantom simulated on the volume source that assume to be cylinder and effective dose calculated for five basic radioisotope with MCNP code. The diagram of effective dose and absorbed dose versus penetration depth and comparison of effective dose at any time after accident shows that all radioisotopes deposited energy in the body. Their importance differ with gamma energy, half life and the fission product yield in the reactor.

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