Study on judgment arithmetic for the symmetric attribute of plutonium material in sealed container

The symmetric attribute is an important attribute of plutonium component in nuclear weapon. When the shape of radioactive source with uniform distribution is symmetric on axial direction, measured values of activity in the symmetric direction comply with the normal distribution. Based on this principle, a kind of judgment's arithmetic that can judge the attribute of plutonium in the container is established combining Shapiro Wilk small sample normal distribution test method and F-distribution test method of deleting singular valve with location method of singular value. Experimental data of three models has been analyzed using this judgment's arithmetic. The results show that this judgment's arithmetic can determine accurately the symmetric of plutonium component. (authors)