What are the 3 regions of high exposure concern? High beam, medium beam, low beam Alpha radiation, neutron radiation, and gamma radiation Primary beam, scattered radiation, and leakage Acute, chronic, and deadly
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1. The internal radiation hazard of the various types of ionizing radiation (relative to one another) is: a) the same, regardless of the radiation type b) high for alphas, moderate for betas, low for gammas c) low for alphas, moderate for betas, high for gammas 2. Which is true about Biological Dose and Physical dose: a) The physical dose is always equivalent to biological dose b) The physical dose multiplied by the weighting factor (for radiation: type, alpha, gamma, beta) is equal to the biological dose c) Physical dose is never equivalent to biological dose d) We have no way to calculate biological dose, but we can calculate physical dose with absolute certainty. 3. Betas will travel the farthest in: a) lead (̑ = 11.35 g/cm3) b) copper (̑ = 8.96 g/cm3) c) water (̑ = 1 g/cm3) d) cadmium (̑ = 8.65 g/cm3) 4. Prior to using a survey meter, what should one consider? a) The type of source being measured and if that survey meter can accurately measure that source b) Confirm calibration within the past 1-year, e.g., calibration sticker c) That they know how to use, read, and operate the survey meter d) A, B, and C, all should be taken into account. 5. Which region of the gas-filled detector curve would be LEAST desirable in which to try to operate a radiation detector? a) proportional b) ion chamber c) Geiger plateau d) continuous discharge 6. Which type of x-rays shown below can cause occupational radiation exposure? a) Leakage b) Useful beam c) Scatter d) All of the above
Sri K.
Q11 Which of the following present(s) the highest risk of internal radiation exposure (radioactive materials inside the body) by considering the ability of penetration? Alpha particles Beta particles Neutron particles Gamma radiation and x-ray Q12 Which of the following is true for Class IV lasers? Generally, this refers to lasers of power equal 5 million watts. Eyes could be damaged even from a diffuse reflection. Serious controls are requred needed to achieve adequate safety. Option 2 and 3 are both correct. Q13 Which of the following laser wavelength(s) present the highest risk of retinal exposure? UV Far IR Near IR Visible wavelengths Q14 What single item could have prevented most laser accidents? Enclosure of laser source Laser safety goggles Warning lights Laser curtains
Riaz A.
E GO Someone stands near a radioactive source and receives doses of the following types of radiation: $\gamma$ rays $(20 \mathrm{mrad}, \mathrm{RBE}=1),$ electrons $(30 \mathrm{mrad}, \mathrm{RBE}=1),$ protons $(5 \mathrm{mrad}, \mathrm{RBE}=10),$ and slow neutrons $(5 \mathrm{mrad}$ $\mathrm{RBE}=2$ ). Rank the types of radiation, highest first, as to which produces the largest biologically equivalent dose.
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