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A 70.0 kg person experiences a whole-body exposure to alpha radiation with energy of 1.50 MeV. A total of $5.00 \times 10^{12}$ alpha particles is absorbed. (a) What is the absorbed dose in rad? (b) What is the equivalent dose in rem? (c) If the source is 0.0100 g of $^{226}$ Ra (half-life 1600 years) somewhere in the body, what is the activity of the source? (d) If all the alpha particles produced are absorbed, what time is required for this dose to be delivered?

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a. 1.71 $\mathrm{rad}$b. 34.3 $\mathrm{rem}$c. $3.65 \times 10^{5} \mathrm{Bq}$d. $1.37 \times 10^{7} \mathrm{s}$

Physics 103

Chapter 30

Nuclear and High-Energy Physics

Atomic Physics

Nuclear Physics

Particle Physics

Cornell University

University of Washington

University of Winnipeg

Lectures

02:42

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. The theory of quantum mechanics, a set of mathematical rules that describe the behaviour of matter and its interactions, provides a good model for the description of atomic structure and properties.

02:26

In physics, nuclear physics is the field of physics that studies the constituents and interactions of atomic nuclei. The most commonly known applications of nuclear physics are nuclear power generation and nuclear weapons technology, but the research has provided application in many fields, including those in nuclear medicine and magnetic resonance imaging, ion implantation in materials engineering, and radiocarbon dating in geology and archaeology.

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killing's this question would have this person who experienced the whole body. Exposure to radiation was the energy of 11 fact in TV and a torch for a lot of other particle system is absorbed. So we want to ask first, what is up sob stuff in that? Oh, so you wanted to do sad? Let's first try, Tio, calculate how much energy is absorbed so rad. We know that red is roughly is in some way. It tells us energy per kilogram, and we're not 70 kilograms. So in order to this energy procurement we wanted first figure out what's true for energy, and the total energy can be fought here by conversion. A conversion off. Mmm, off units. Because we know that, um, we have what we have five tops, too. Choosy. Twelves off a critical. And each gypsum has 1.5. And TV is that also article Brutus to jar. So this is a new brick follow. You hate your job. So together everything gives us we'll put two job and absorb doses for point huger. Over 70 he looked round that kid's assume 0.0 once similar one John for Cuba and this is zero point isn't all about Civil Gray, which has worked with Silver one Rat and what is equivalent toasted bread. We know that for over pretty cool. No way have our b e of 20. So Iran would have 20 times 100 civil. What brat equals 34.2 Gray proceeding mask. It's a source is inquisitive friend. And with 1/2 life off 60 100 years away, the body What is activity off the source? So that is to say, we need to fight dear sir, and over just he way to fights a comedy case in a second. So let's first fine hall end this fight first. Find Hope Buddy was a lumber off. Adam's here. We know in soon, quite soon once. Here's your apron. Now we know that top is a masked number is 236 No, 226 times massive protons. This's 2.65 times 10 to 19 uh, Lou set. And then we also need to find so we have to go to and over t equals that got us in. So we also defend letter. It was confined Lampton because we already know the half of it. You slipped it to over half life and we don't have to have. Here is 60 100 years. Oh, fans tuned to the seven seconds clear here. So this gives us our 1.37 perhaps. Can't you see Negative 11. Sit in reverse. So now we have time and we can Yeah, you see, stood up was to find our rate and the great The activity of the source is 3.63 turns 10 years a race D case presented very last question that bore of a particles of salt. What time is acquired for the stars to deliver it? Hurry. Okay, so we know such this's a rate for each second There is this much tea place and we weren't a total of five times 10 to the 12th t All right, The case, because we were a total five times 10 to the trump of a product was to sort. So time is five times 10 twelves actually found in many respects is a significant numbers into the trough divided by 3.63 times turned his face per second. Insidious. Well, 0.38 homes tend to the force second. So are you. Zeus is 2 30 minutes. So it's around four hours

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