STUDIES ON THE POCKET DOSIMETER FOR PREVENTION OF RADIATION INJURIES : Ⅴ. THE DISTRIBUTION OF SCATTERED RADIATION IN EMPLOYMENT OF X-RAY APPARATUS INDUSTRIAL PURPOSES
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1.Owing to the environment of the industrial X-ray work being spherical iron tank, the scattered radiation quantities were not always inversely proportional to the square of distance from the radiation source. Therefore, to show exactly the safety region in distance was difficult. However, if we assume that the safety regaions are the space in which the radiation quantities are smaller than 10 percent of the maximum tolerance doses of 0.3 r/week which was adopted in the Recommendations of the International Committee of Radiation Protection (1954), it is necessary that to maintain a distance of more than 6 meters from the radiation source when one radiographs under The conditions of 110 kVp, 5 mA 2.5 minutes exposure, and twenty times per day. 2.On the side opposite The radiation source through the iron wall (16 mm thickness), all spaces may be considered safe except the spaces lying within the main beam flux, because the radiation quantities of direct beam penetrating the iron well are very little, and the iron wall further prevents to some extent the scattering radiation produce on the source side reaching the opposite side. 3.We could not accurately correlate the counted numbers of the count rate meter with the roentgen unit. 4.Although the valuces which were obtained whit the pocket chambers at the points shown in Fig.3 were not large, yet as show in the results II, a (Table II ), the indication was the pocket chambers carried by the workers was much large. This is importance to bear in mind when we wmploy the pocket chambers.
- Yamaguchi University Graduate School of Medicineの論文
- 1957-04-30
Yamaguchi University Graduate School of Medicine | 論文
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