Void Fraction Measurements Using Neutron Radiography

Void Fraction Disturbances in Bubbly

-The paper is concerned with the flow of dispersions of gas bubbles in liquid, with bubble sizes such that the inertia forces on the bubbles are of importance to the dynamics. One-dimensional conservation equations are derived, which govern the flow when the deviations from the uniform state are small. These are used to describe the features of the propagation of void fraction disturbances, and...

Discrete tomography in neutron radiography

Discrete tomography (DT) is an imaging technique for reconstructing discrete images from their projections using the knowledge that the object to be reconstructed contains only a few homogeneous materials characterized by known discrete absorption values. One of the main reasons for applying DT is that we will hopefully require relatively few projections. Using discreteness and some a priori in...

Neutron Radiography, Techniques and Applications

After describing the principles of the "in pool" and "dry" installations, techniques used in neutron radiography are reviewed. Use of converter foils with silver halide films for the direct and transfer methods is described. Advantages of the use of nitrocellulose film for radiographying radioactive objacts are discussed. Dynamic imaging is shortly reviewed. Standardization in the field of neut...

Non-destructive Testing: Neutron Radiography

Study of corrosion in aluminium using neutron radiography technique

Neutron rad i ()~ra ph y techn ique has hecn ;ILiopted lo r detecti on or co rrosion in aluminium hy rillin g ,Irti riciall y l11ade hol cs (1n al uminium slah with 1\1(01-1),. Thc cont ras t hetwcen the opti c;iI densi ties or corrosion products and ;;lu lll i niulll slah W; IS ;Issessed rrom the densitolllctri c l11easu rements. Vari ati oll o r opti cal density difference with sample thickn ...