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# Problem: In proton beam therapy, a beam of high-energy protons is used to deliver radiation to a tumor, killing its cancerous cells. In one session, the radiologist calls for a dose of 4.9×108 protons to be delivered at a beam current of 120 nA.How long should the beam be turned on to deliver this dose?

###### FREE Expert Solution

In this problem, we are dealing with current, number fo protons, and the time.

Current and time are related by:

$\overline{){\mathbf{Q}}{\mathbf{=}}{\mathbf{i}}{\mathbf{t}}}$ where Q is the charge, i is the current, and t is the time.

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###### Problem Details

In proton beam therapy, a beam of high-energy protons is used to deliver radiation to a tumor, killing its cancerous cells. In one session, the radiologist calls for a dose of 4.9×108 protons to be delivered at a beam current of 120 nA.

How long should the beam be turned on to deliver this dose?