What is the grid ratio of a grid with lead strips height of 4mm and space of 0.5mm apart?

To determine the grid ratio, you divide the height of the lead strips by the distance between them. In this scenario, the height of the lead strips is 4 mm, and the space between them is 0.5 mm. By performing the calculation, you take the height (4 mm) and divide it by the sum of the height of the lead strips and the space (4 mm + 0.5 mm = 4.5 mm).

So, the grid ratio calculation looks like this:

Grid Ratio = Height of lead strips / (Height of lead strips + Distance between strips)

Grid Ratio = 4 mm / (4 mm + 0.5 mm) = 4 mm / 4.5 mm

To express this as a ratio, we can simplify this into a fraction.

Converting it gives approximately 0.89. To express this as a standard grid ratio notation, we multiply both the numerator and denominator by 2 to remove the decimal, resulting in a ratio of 8:9, which can be closely represented by the choices available.

However, the typical notation for ratios might not line up perfectly with such a simple division; therefore, grid ratios tend to favor whole numbers. The closest