工業用X線の防護法
第2報:利用線の防護法
1960 年 29 巻 4 号 p. 217-225
詳細
1960 年 29 巻 4 号 p. 217-225
As for X-rays to be guarded against, two cases are considered: the cases of direct rays and secondary rays from neighbouring objects. Of the two, the direct one is concerned with the following results.
1) For eliminating soft X-rays, filter effect of various materials is examined, and metals of intermediate atomic numbers are found most effective against the rays of 100_??_300 kV which are being used for non-destructive inspection.
2) Based on the curve of attenuation for lead, methods of protection and calculating the leadequivalence of thickness necessary for it under various given conditions are derived. 3) From the attenuation curves for materials other than lead, their lead-equivalences are obtained in terms of applied voltage, and the method of calculating the thickness of materials necessary for protection is established.
