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| Research on calculation method of the penetrating radiation field for the highly enriched Plutonium |
| YANG Yongxin, WANG Song |
| 92609 PLA, Beijing 100077 China |
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Abstract Objective The calculation of the penetrating radiation field is required around highly enriched plutonium for the purpose of the workers' radiation safety assessment and the nuclear safety review, in which the penetration mechanism and the strength of the neutron and γ from plutonium needs to be analyzed deeply.Methods The composition and the radiation characteristic of the highly enriched plutonium is analyzed deeply, then the method which is appropriate for the γ and neutron dose rate calculation of the highly enriched plutonium is put forward based on the attenuation law of γ broad-beam and the neutron removal cross section theory.Results The theoretical calculation value of the surface γ dose rate and the neutron flux close to the highly enriched plutonium material is the same order of magnitude as the measured value, and shows that the model is correct. The actual measured values of γ dose rate from 0cm,30cm,100cm from the surface of plutonium material are all larger than the calculated values, and the farther the distance is, the larger the relative error is. The relative error between the neutron simulation and the actual measurement decreases with the increase of distance.Conclusion Through principle analysis and experimental verification, the calculation models presented for the penetrating radiation dose is reasonably and can meet the requirement of scientific and veracity.
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Received: 19 December 2017
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