What exposure time is required to achieve 6 mAs if 300 mA is selected for a certain exposure?

To determine the required exposure time to achieve a specific milliampere-seconds (mAs) with a given milliamperage (mA), you can use the formula:

[ \text{mAs} = \text{mA} \times \text{Time in seconds} ]

In this case, you want to achieve 6 mAs with a current of 300 mA. Rearranging the formula to solve for time gives:

[ \text{Time in seconds} = \frac{\text{mAs}}{\text{mA}} ]

Substituting the known values:

[ \text{Time in seconds} = \frac{6 , \text{mAs}}{300 , \text{mA}} = 0.02 , \text{seconds} ]

To convert seconds into milliseconds, you multiply by 1000:

[ 0.02 , \text{seconds} \times 1000 = 20 , \text{ms} ]

Thus, the required exposure time to achieve 6 mAs with 300 mA is 20 ms. Understanding this relationship between mAs, mA, and time is crucial for calculating