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Radiochemistry and Nuclear Chemistry self-test # 6

Comprises Chapter 6

This is a self grading test of your knowledge. It consists of 20 randomly chosen questions with single or multiple answers. The questions with single answers have round buttons and the questions with perhaps more than one correct answer have square buttons. Answer the questions by clicking on the corresponding button in the list of alternative answers. On questions with a single answer (round buttons to click on), it is only possible to mark one of the alternative answers as correct.
Grading of the completed test is automatic when you click on the button marked "GRADE MY ANSWERS" at the end of the test.
Correct answers can be read by clicking on the button having the same number as the question. You find these buttons at the end of the test. You can also refresh your memory first by jumping directly to the answer buttons and click on them to get answers and read relevant parts of the book before doing this test.
On the questions with one or more possible answers (squares to click on) only the first click on each button is recorded as an answer. Hence you must click on the reset button below the question before you can change the original answer(s). Failure to do this will probably make the answers on this question regarded as wrong in the grading process.
Please observe that your teacher may require a deeper understanding of the treated subject than reflected by this test. In case you have any valuable comments or questions regarding this self-test, explain them in an e-mail to: jol@nc.chalmers.se 



Question # 1 (One or more answers) The decrease in intensity of a beam of protons when passing through matter is caused by

    A) Ionization
    B) Excitation
    C) Scattering against atomic nuclei
    D) Coulomb excitation
    E) Nuclear reactions

In case of an error in the answers above, please click on this button before making any corrections 

Question # 2 (One answer) What is a Bragg peak

    A) The blackening maximum in an X-ray diffraction picture
    B) A nob used for adjustment of gamma cameras
    C) A maximum in the error square sum when fitting a crystal structure
    D) The maximum in ionization caused by charged ions near the end of their range in matter
    E) The optimal scattering angle in a crystal refractometer

Question # 3 (One answer) Which of the following radionuclides is used in most RTG:s for space vehicles

    A) 90Sr
    B) 137Cs
    C) 210Pb
    D) 238U
    E) 238Pu

Question # 4 (One or more answers) Beta+ particles are absorbed by matter through various processes. Which of the following processes occur in this case?

    A) Bremsstrahlung emission
    B) Ionization
    C) Excitation
    D) Photo effect
    E) Annihilation

In case of an error in the answers above, please click on this button before making any corrections 

Question # 5 (One or more answers) Absorption curves for ionizing radiation

    A) are measured in a setup which uses a narrow collimated beam
    B) are measured using a broad beam of particles
    C) are valid for all kinds of radiation of the same particle energy
    D) depends on the material by which the radiation is absorbed
    E) are often expressed in terms of the linear density of the absorber

In case of an error in the answers above, please click on this button before making any corrections 

Question # 6 (One or more answers) In autoradiography one often uses

    A) a video camera
    B) the ability of radiation to blacken photographic film
    C) amplification foils of lead to increase contrast
    D) aluminum casettes in order to protect the film against the radiation
    E) a strong external radiation source in order to improve resolution

In case of an error in the answers above, please click on this button before making any corrections 

Question # 7 (One or more answers) The decrease in intensity of a beam on neutrons passing through materia is caused by

    A) scattering with energy loss
    B) ionization
    C) nuclear reactions
    D) bremsstrahlung
    E) annihilation caused by the normal anti-neutrons

In case of an error in the answers above, please click on this button before making any corrections 

Question # 8 (One answer) When calculating the transmission of un collimated g-radiation through matter one uses a correction factor which is called the "dose build-up factor". This factor can be estimated at a given energy from

    A) the reaction cross section
    B) the relaxation length
    C) the thickness
    D) the absorption coefficient
    E) the surface structure of the absorber

Question # 9 (One or more answers) Absorption of g-radiation can be used to measure

    A) the thickness of an absorber
    B) streaming velocity in pipes
    C) the wall thickness in pipes
    D) the level in containers
    E) the amount of fish in the arctic ocean

In case of an error in the answers above, please click on this button before making any corrections 

Question # 10 (One or more answers) The probability of Compton scattering for high energy photons passing through a material

    A) increases with the energy of the radiation
    B) decreases with the energy of the radiation
    C) increases with the atomic number of the material
    D) decreases with the atomic number of the material
    E) is independent of the energy of the radiation and the atomic number of the material

In case of an error in the answers above, please click on this button before making any corrections 

Question # 11 (One or more answers) A radionuclide battery normally consists of one or more of the following parts

    A) radioactive material
    B) radiation shield
    C) instruction sheets
    D) thermoelements
    E) cooling fins

In case of an error in the answers above, please click on this button before making any corrections 

Question # 12 (One answer) Backscattering of b-particles is caused by

    A) a backing material
    B) small black holes
    C) vacuum polarization
    D) the Cerenkov effect
    E) the uncertainty relation

Question # 13 (One answer) What is the energy of the photons from annihilation of a positron?

    A) 0.104 MeV
    B) 0.275 MeV
    C) 0.511 MeV
    D) 0.662 MeV
    E) 1.022 MeV

Question # 14 (One answer) Cerenkov radiation is produced when

    A) electrons breaks the sound barrier in air
    B) electrons move faster than light in any medium
    C) electrons move faster than light in vacuum
    D) electrons move faster than sound in water
    E) electrons are accelerated in a cyclotron

Question # 15 (One or more answers) The conversion between count rate and decay rate is given by an equation of the type R = k*A. Which of the efficiency factors listed below are used to calculate the value of k?

    A) The sample efficiency
    B) The geometric efficiency
    C) The absorption efficiency
    D) The transmutation efficiency
    E) The detector efficiency

In case of an error in the answers above, please click on this button before making any corrections 

Question # 16 (One answer) The amount of energy transferred per unit length from radiation to matter is called

    A) The straggling
    B) The LET value
    C) The ALI value
    D) The breaking ability
    E) The annihilation

Question # 17 (One answer) Ionization caused by the more energetic secondary electrons produced in passage of heavy ions through matter is usually called

    A) a-tracks
    B)
    b-tracks
    C)
    g-tracks
    D)
    d-tracks
    E)
    e-tracks

Question # 18 (One answer) The maximum energy of beta radiation can be determined by

    A) its count rate maximum in a GM-tube
    B) the energy of photons from annihilation processes
    C) measuring the dose build-up factor in concrete
    D) measuring the absorption curve for aluminum
    E) the amount of bremsstrahlung emitted while passing through vacuum

Question # 19 (One or more answers) During passage of 1.00 MeV g-radiation through matter some of the following processes can occur. Which?

    A) Pair production
    B) Emission of Cerenkov radiation
    C) A photo effect
    D) Compton scattering
    E) Coherent scattering

In case of an error in the answers above, please click on this button before making any corrections 

Question # 20 (One or more answers) When calculation radiation doses to humans one usually assumes that

    A) ionizing radiation is benign
    B) the body consists only of water
    C) dosimeters never work
    D) a lab coat offers a good protection against
    g-radiation
    E) all bone mass in the body is concentrated to the head

In case of an error in the answers above, please click on this button before making any corrections 


In case of an error in the answers above, please click on this button before making any corrections 

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(Updated 2001-08-20)