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College Physics

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

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BuyFindarrow_forward

College Physics

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

One half the γ rays from 99mTc are absorbed by a 0.170−mm−thick lead shielding. Half of the γ rays that pass through the first layer of lead are absorbed in a second layer of equal thickness. What thickness of lead will absorb all but one in 1000 of these γ rays?

To determine

The thickness of lead will absorb.

Explanation

Given info:

The tick ness of lead shielding is

t =0.170 mm

Formula used:

Net thickness is

  t=eachlayer×thicknesst'=x×t

Calculation:

Since half of γ ray that pass through the first layer is absorbed in a second layer of equal thickness

  12x=11000ln12x=ln1

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