Chapter 32, Problem 16PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# A beam of 168−MeV nitrogen nuclei is used for cancer therapy. If this beam is directed onto a 0.200−kg tumor and gives it a 2.00−Sv dose, how many nitrogen nuclei were stopped? (Use an RBE of 20 for heavy ions.)

To determine

The number of nitrogen nuclei are stopped

Explanation

Given info:

The beam of nitrogen nuclei

â€ƒâ€ƒE=168MeV=168Ã—1.602Ã—10âˆ’13Jm=0200kgdoes=2.00SvRBE=20

Formula used:

to calculate the number of nitrogen nuclei

â€ƒâ€ƒN=remÃ—mREBÃ—E

Calculation:

Substituting the values

â€ƒâ€ƒN=200Ã—0

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