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Chapter 42: Q 25 Exercise (page 1236)

Identify the unknown isotope X in the following decays.

a.Th230鈫�X+伪b.S35鈫�X+e-+谓炉c.X鈫�K40+e++谓d.Na24鈫�Mg24+e-+谓炉鈫�X+纬

Short Answer

Expert verified

Hence, the values of X are:

a.)X=Ra226b.)X=Cl35c.)X=Ca40d.)X=Mg24

Step by step solution

01

Given information

a.Th230鈫�X+伪b.S35鈫�X+e-+谓炉c.X鈫�K40+e++谓d.Na24鈫�Mg24+e-+谓炉鈫�X+纬

02

Explanation (a)

In the following decays, we need find unknown isotope X:

a.)Th230鈫�X+伪

The decay is:

Th230=X+He4X=Ra226

03

Explanation (b)

The decay is:

04

Explanation (c)

The decay is:

05

Explanation (d)

The decay is:

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A 115 mCi radioactive tracer is made in a nuclear reactor. When it is delivered to a hospital 16 hours later its activity is 95 mCi. The lowest usable level of activity is 10 mCi.

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