β励起X線によるラジオグラフィ

抄録

The availability of X-rays excited by ⁹⁰Sr-⁹⁰Y betas in lead target for technical radiography is studied. The β-excited X-ray source consists of ⁹⁰Sr of 80 mc and lead target of suitable thickness to produce X-radiation. The energy spectrum and the dose-rate distribution of the X-ray source are observed, and exposure charts for radiography are made with the use of step wedges of steel and aluminium alloy.
X-ray energy spectrum is a continuous bremsstrahlung curve up to 500 keV with the peak in 74 keV of PbKX-rays, and the X-ray intensity was about 10mr/h at the distance of 30cm from the front of X-ray source. The radiographs, obtained with the β-excited X-ray source, show good definition in spite of the fact that the active volume is great (3mm diameter and 8mm long), and indicate that ⁹⁰Sr-⁹⁰Y β-excited X-radiography can be used for steel of thickness up to about 3cm.