Final answer:
The ratio of primary radiation to scattered radiation transmitted through a grid in medical imaging is determined by measuring the intensities of both types of radiation after passing through the grid, which cannot be established without specific data.
Step-by-step explanation:
The question pertains to the concept of radiation transmission through a grid, specifically in a medical setting where x-rays are used. The ratio of primary radiation to scattered radiation transmitted through a grid is a critical parameter in medical imaging, as it affects the image contrast and quality.
However, without specific numbers and measurements in relation to a particular machine or situation, an exact numerical ratio cannot be provided. Grids are used to improve image quality by absorbing scattered radiation before it reaches the detector, thus enhancing the proportion of primary radiation that is used to create the image. The ratio mentioned in the question aims to express the effectiveness of this process. To determine such a ratio in practice, one would measure the intensity of primary radiation that reaches the detector and compare it to the amount of scattered radiation that is also detected, after the x-rays have passed through the grid. This information is typically obtained through calibration and testing of the imaging system.