<< Chapter < Page Chapter >> Page >

Conceptual questions

Why is a PET scan more accurate than a SPECT scan?

Got questions? Get instant answers now!

Isotopes that emit α radiation are relatively safe outside the body and exceptionally hazardous inside. Explain why.

Alpha particles do not penetrate materials such as skin and clothes easily. (Recall that alpha radiation is barely able to pass through a thin sheet of paper.) However, when produce inside the body, neighboring cells are vulnerable.

Got questions? Get instant answers now!

Ionizing radiation can impair the ability of a cell to repair DNA. What are the three ways the cell can respond?

Got questions? Get instant answers now!


What is the dose in mSv for: (a) a 0.1-Gy X-ray? (b) 2.5 mGy of neutron exposure to the eye? (c) 1.5m Gy of α exposure?

Got questions? Get instant answers now!

Find the radiation dose in Gy for: (a) A 10-mSv fluoroscopic X-ray series. (b) 50 mSv of skin exposure by an α emitter. (c) 160 mSv of β and γ rays from the 40 K in your body.

Gy = Sv RBE : a. 0.01 Gy; b. 0.0025 Gy; c. 0.16 Gy

Got questions? Get instant answers now!

Find the mass of 239 P u that has an activity of 1.00 μCi .

Got questions? Get instant answers now!

In the 1980s, the term picowave was used to describe food irradiation in order to overcome public resistance by playing on the well-known safety of microwave radiation. Find the energy in MeV of a photon having a wavelength of a picometer.

1.24 MeV

Got questions? Get instant answers now!

What is the dose in Sv in a cancer treatment that exposes the patient to 200 Gy of γ rays?

Got questions? Get instant answers now!

One half the γ rays from 99 m T c 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?

1.69 mm

Got questions? Get instant answers now!

How many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to α activity?

Got questions? Get instant answers now!

A plumber at a nuclear power plant receives a whole-body dose of 30 mSv in 15 minutes while repairing a crucial valve. Find the radiation-induced yearly risk of death from cancer and the chance of genetic defect from this maximum allowable exposure.

For cancer: ( 3 rem ) ( 10 10 6 rem · y ) = 30 10 6 y , The risk each year of dying from induced cancer is 30 in a million. For genetic defect: ( 3 rem ) ( 3.3 10 6 rem · y ) = 9.9 10 6 y , The chance each year of an induced genetic defect is 10 in a million.

Got questions? Get instant answers now!

Calculate the dose in rem/y for the lungs of a weapons plant employee who inhales and retains an activity of 1.00 μ Ci 239 Pu in an accident. The mass of affected lung tissue is 2.00 kg and the plutonium decays by emission of a 5.23-MeV α particle. Assume a RBE value of 20.

Got questions? Get instant answers now!

Additional problems

The wiki-phony site states that the atomic mass of chlorine is 40 g/mol. Check this result. Hint: The two, most common stable isotopes of chlorine are: 17 35 Cl and 17 37 Cl . (The abundance of Cl-35 is 75.8 % , and the abundance of Cl-37 is 24.2 % .)

atomic mass ( Cl ) = 35.5 g/mol

Got questions? Get instant answers now!

A particle physicist discovers a neutral particle with a mass of 2.02733 u that he assumes is two neutrons bound together.

(a) Find the binding energy.

(b) What is unreasonable about this result?

Got questions? Get instant answers now!

A nuclear physicist finds 1.0 μ g of 236 U in a piece of uranium ore ( T 1/2 = 2.348 × 10 7 y ). (a) Use the decay law to determine how much 236 U would had to have been on Earth when it formed 4.543 × 10 9 y ago for 1.0 μ g to be left today. (b) What is unreasonable about this result? (c) How is this unreasonable result resolved?

a. 1.71 × 10 58 kg ; b. This mass is impossibly large; it is greater than the mass of the entire Milky Way galaxy. c. 236 U is not produced through natural processes operating over long times on Earth, but through artificial processes in a nuclear reactor.

Got questions? Get instant answers now!

Questions & Answers

friction ka direction Kaise pata karte hai
Rahul Reply
A twin paradox in the special theory of relativity arises due to.....? a) asymmetric of time only b) symmetric of time only c) only time
Varia Reply
fundamental note of a vibrating string
fasoyin Reply
what are matter waves? Give some examples
mallam Reply
according to de Broglie any matter particles by attaining the higher velocity as compared to light'ill show the wave nature and equation of wave will applicable on it but in practical life people see it is impossible however it is practicaly true and possible while looking at the earth matter at far
Mathematical expression of principle of relativity
Nasir Reply
given that the velocity v of wave depends on the tension f in the spring, it's length 'I' and it's mass 'm'. derive using dimension the equation of the wave
obia Reply
What is the importance of de-broglie's wavelength?
Mukulika Reply
he related wave to matter
at subatomic level wave and matter are associated. this refering to mass energy equivalence
it is key of quantum
how those weight effect a stable motion at equilibrium
Nonso Reply
how do I differentiate this equation- A sinwt with respect to t
Evans Reply
just use the chain rule : let u =wt , the dy/dt = dy/du × du/dt : wA × cos(wt)
I see my message got garbled , anyway use the chain rule with u= wt , etc...
de broglie wave equation
LoNE Reply
vy beautiful equation
what is electro statics
fitsum Reply
when you consider systems consisting of fixed charges
Diagram of the derive rotational analog equation of v= u+at
Nnamnso Reply
what is carat
Arnulfo Reply
a unit of weight for precious stones and pearls, now equivalent to 200 milligrams.
a science that deals with the composition, structure, and properties of substances and with the transformations that they undergo.
what is chemistry
Mrs Reply
what chemistry ?
where are the mcq
Fred Reply
acids and bases

Get the best University physics vol... course in your pocket!

Source:  OpenStax, University physics volume 3. OpenStax CNX. Nov 04, 2016 Download for free at http://cnx.org/content/col12067/1.4
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'University physics volume 3' conversation and receive update notifications?