Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100502-100502.doi: 10.11889/j.0253-3219.2019.hjs.42.100502

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Study on γ-ray self-absorption correction in plutonium production rates experiment

Zijie ZHU Tonghua LU Xinxin AN Li HAN,Tonghua LU Xinxin AN Li ZHU,Xinxin LU,Li AN   

  1. Institute of Nuclear Physics and Chemistry, China Academy of Engineering, Mianyang 621900, China
  • Received:2019-03-19 Revised:2019-07-17 Online:2019-10-13 Published:2019-10-16
  • Supported by:
    National Natural Science Foundation of China(11775200);No.11575165) and National Research Projects on the Development of Magnetic Confined Fusion Energy(2015GB108006)

Abstract: Background

γ-ray of 277.6 keV needs to be measured in plutonium production pates experiment. Self-absorption effect of depleted uranium activated foils will affect the accuracy of the measuring results.

Purpose

This study aims to correct the γ-ray self-absorption effect of the activation foils in the plutonium production rates experiment.

Methods

First of all, plane source method and substance method were applied to MCNP (Monte Carlo N Particle Transport Code) to simulate the self-absorption theory, and results at various detection distance were obtained. Then experiments using 243Am plane radioactive source, depleted uranium foils and the HPGe detector were carried out to obtain self-absorption factors of 277.6 keV gamma-ray for depleted uranium activated foils with different thickness.

Results

The deviation of these two methods for simulation calculation of self-absorption factor is less than 1.3% at detection distance of 9 cm. The deviation between experimental measurement and simulation computation is less than 2.5% for depleted uranium foils with different thickness.

Conclusion

The reliability of theoretical simulation is proved by the verification between experiment and theory in this study. Hence the self-absorption correction factors of samples under different measurement models can be obtained by theoretical simulation in the plutonium production rates experiment.

Key words: Plane radioactive source method, Substance method, Self-absorption correcting factor

CLC Number: 

  • TL99,O571.32