Use of gamma ray for examination will be allowed for tie-ins and wherever radiography by x-ray is not possible , subjected to approval of employer .
允许使用伽马射线检测固定件,但无论何时都不能使用x射线照相术,服从雇主的批准。
In some regions of the world the use of such spaces is believed to increase the risk of lung cancer more than any other common factor except smoking . Radon is used in radiotherapy , radiography , and research .
In order to investigate the blur caused by the container in proton radiography , the expression of blurring fwhm of the container was deduced on the base of the multiple coulomb scattering and the characteristic of the lens imaging system .