Radiochemistry and Nuclear Chemistry self-test # 13

Comprises Chapter 13

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) An injector is

    A) a device for administering pharmaceuticals
    B) a person operating an ion source
    C) a magnet in a powerful ion source
    D) an accelerator between the ion source and the main machine
    E) a device which feeds gas to an ion source

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

Question # 2 (One answer) The K-value for a cyclotron is defined by the equation

    A) K = B*r/q2 
    B) K = A + Z
    C) K = E/A
    D) K = E*A/z2 
    E) K = z2*e*A2 

Question # 3 (One answer) When charged particles move in curved tracks at high velocity they emit

    A) g-radiation
    B) electrons
    C) neutrinos
    D) synchrotron radiation
    E) Cerenkov light

Question # 4 (One answer) Why can the Alvarez design permit a higher acceleration per drift tube then the Wideröe design?

    A) It is smaller
    B) The drift tubes act as cavities for the micro waves
    C) It can be operated at a higher pressure which reduces the risk of sparking
    D) The drift tubes can be grounded
    E) The drift tubes are better insulated from ground

Question # 5 (One answer) If the frequency in a cyclotron is increased slightly during normal operation, what happens to the beam intensity?

    A) It increases strongly
    B) It increases a little
    C) Nothing
    D) It decreases somewhat
    E) It becomes zero

Question # 6 (One answer) SSC is an abbreviated name for

    A) a still undiscovered heavy element
    B) a superconducting quark detector
    C) a circular type of linear accelerator
    D) a cyclotron with several bending magnets
    E) a common type of hospital cyclotron

Question # 7 (One answer) A van de Graaff accelerator generates its accelerating potential by

    A) a strong magnetic field
    B) an extremely good elimination of disturbing fields
    C) an advanced moving-belt generator
    D) using a long abstract channel
    E) multiple thermoelement bridges

Question # 8 (One or more answers) n-fluxes of useful intensity can be produced by

    A) spallation reactions in lead irradiated by high energy protons
    B) nuclear reactions between light elements and high energy ions
    C) fission of heavy elements in nuclear reactors
    D) cosmic radiation in heavy water
    E) irradiation of light elements by
    a-particles from a suitable radionuclide

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

Question # 9 (One answer) Transformer-rectifier accelerators are based on

    A) Behring's law
    B) the Cockcroft-Walton design
    C) hovering electron fields
    D) the Granitski acceleration principle
    E) the van de Graaff design

Question # 10 (One answer) What happens to the ion current in amperes when the ionic charge decreases at constant beam intensity (in terms of ions per time unit)?

    A) It decreases
    B) Nothing
    C) It increases

Question # 11 (One answer) When heavy ions of low charge pass at high velocity through matter they

    A) keep their charge
    B) increase their charge
    C) decrease their atomic number
    D) pick up more electrons
    E) become uncharged

Question # 12 (One answer) What type of accelerator has a tank where the energy is supplied by an antenna?

    A) Alvarez accelerator
    B) Cyclotron
    C) Synchrotron
    D) van de Graaff accelerator
    E) Wideröe accelerator

Question # 13 (Right/Wrong) Linear single stage accelerators can in fact accelerate ionized neutrons

    A) Right
    B) Wrong

Question # 14 (One answer) A thin foil is often positioned in the beam between two accelerators operating in tandem. Such a foil is called a

    A) buncher
    B) stripper
    C) collector
    D) energizer
    E) carrier

Question # 15 (One answer) Positive ions are produced in a typical ion source by

    A) irradiation with electrons
    B) heating of a gas
    C) intensive IR-light
    D) irradiation with neutrons
    E) proton addition

Question # 16 (One answer) A linear multistage accelerator uses drift tubes. How should they change when the energy of the accelerated ions increases along the machine?

    A) They should become shorter
    B) They should all have the same length
    C) They should become longer
    D) Their length should approach half their diameter
    E) Their diameter should begin to increase

Question # 17 (One or more answers) In a linear multistage accelerator

    A) all acceleration takes place inside the drift tubes
    B) one can only accelerate negative ions
    C) all acceleration takes place between the drift tubes
    D) it is possible to change the energy of the beam by a frequency change in the power supply
    E) the emerging beam is a train of short pulses

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

Question # 18 (One answer) When the average charge of the ions from an ion source is increased

    A) the particle flux into an attached accelerator will increase
    B) the energy of the ions emerging from an attached accelerator can be increased
    C) the energy consumption in an attached accelerator will decrease
    D) the ion source becomes hotter
    E) nothing will happen in an attached accelerator

Question # 19 (One answer) In order to be able to produce particles with high kinetic energy in an accelerator it is important that

    A) the g-value is kept sufficiently small
    B) the particles are charged (ions)
    C) the dose rate is kept as low as possible
    D) the particles will not experience any potential gradients
    E) deionized water is used

Question # 20 (One or more answers) van de Graaff machines have been built as

    A) single stage accelerators
    B) tandem units
    C) three-stage accelerators
    D) quadrupel units
    E) symmetric compensators

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

Correct answers to each question can be obtained by clicking on the corresponding button below

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(Updated 2001-08-23)