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(a) The $^{210}$ Po source used in a physics laboratory is labeled as having an actitity of 1.0$\mu \mathrm{Ci}$ on the date it was prepared. A student measures the radioactivity of this source with a Geiger counter and observes 1500 counts per minute. She notices that the source was prepared 120 days before her lab. What fraction of the decays is she observing with her apparatus? (b) Identify some of the reasons that only a fraction of the $\alpha$ s emitted are observed by the detector.

a) $1.23 \times 10^{-3}$b) For a detector this is not possible to cover the entire area of the surface from which decayhappens. So, the counter will show the small fraction of the actual decay only.

Physics 103

Chapter 31

Radioactivity and Nuclear Physics

Nuclear Physics

Cornell University

University of Washington

Simon Fraser University

McMaster University

Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

02:03

The $^{210}$ Po source use…

03:51

A $1.0-\mu \mathrm{Ci}^{13…

0:00

Radioactive copper-64 deca…

03:33

07:11

(a) Calculate the energy r…

14:10

Radium-226, which undergoe…

04:51

A by-product of some fissi…

05:31

The activity of a radioact…

02:01

(a) In $\alpha$ decay of, …

06:51

A sample of radioactive $_…

01:26

The radionuclide 32 $\math…

02:39

A $1.2-\mu \mathrm{Ci}^{13…

02:52

A certain radioactive nucl…

02:04

The isotope 208 Tl undergo…

10:08

($a$) In $\alpha$ decay of…

04:25

A radioactive isotope has …

07:27

$\bullet \mathrm{A} 12.0$ …

05:56

Chromium’s radioactive iso…

04:37

A 1.2$\mu$Ci $^{137}_{55}$…

Hi, friends. Here it is. Given Olive Odium, people 210 developed in the laboratory. Heavy radio activity. One point you know, Micro Curie. After one country days Giger, counter detecting count rate 1500 permanent. We have to find a fraction off. The K second identified the region that only fraction off and far omitted heart observe. But Detective, now I see it. This is the problem Based on rate off, disintegration off radio activity, rate off, disintegration off red activities defined as article toe or not explanation off mine Islam dirty in this problem are not having the value. One microbe jury that is 3.7 10 to the power for vascular on board Lambda is defined as 0.693 and to half life hand half life popular enemies 1 38.4 dates. So the reactivity after the time 1 20 days are is called You are not 3.7 10 to the power food explanation. Lambda is white. 693 No! Yeah. Upon t half that is 1 38.4 days in tow. 1 20 days. So are you will get 2.3 and tow 10 to the power for regular work. Yeah, yeah, yeah. No, no. It is given Giger. Counter heavy. Sorry, Giger. Counter detecting count rate 1500 per minute. That is 1500 upon 60 per second. Our 25 regular. So are deaths by our is called 25 upon 2.3 Tend to the powerful. So it is 1.23 Tend to dip our ministry now be part even about as cool. It is not possible to cover entire area off the surface from which decade occurred. I so the counter herbal. So the small fraction, actually, actually, decade, that's all. Thanks for watching it.

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