SET 3

通報

問題一覧

What is the largest source of natural environmental radiation?

Radon

He developed the fluoroscope in 1898.

Thomas A. Edison

He introduced an interrupterless transformer in 1907.

H.C. Snook

The uncontrolled rapid proliferation of cell is the principal characteristic of radiation induced malignant disease.

true

If the radiologic technologist participates in fluoroscopy, then the occupational radiation monitor should be positioned on the collar above the protective apron.

true

Radiation dose that can reduce the number of sperm or may delay / suppress menstruation:

10 rad

Which of the following are true? 1. Younger tissue and organs are radiosensitive 2. Stem cells are radioresistant 3. Tissues with high metabolic activity are radiosensitive 4. Mature cells are radioresistant

1, 3, and 4

These are the physical factors affecting radiosensitivity: 1. Linear Energy Transfer 2. Protraction and Fractionation 3. Relative Biologic Effectiveness

1, 2, and 3

The probability or frequency of the biologic response to radiation dose increases proportionally with dose; and there is no dose threshold.

Stochastic

Defined as the breakage of the backbone of the long-chain macromolecule.

main-chain scission

A gas-filled detector which has the ability to distinguish between alpha and beta radiation.

Proportional Counter

If the initial ionizing event occurs on the target molecule it is said to be:

Direct effect

Radiation doses to the ovaries / testes which results in permanent sterility.

500 rad

All atoms are electrically neutral: the number of protons equals the number of neutrons. A. True B. False C. Depends on the atom D. Depends on charge

False

The minimum energy required to remove an electron from its orbit.g

Electron binding energy

It is called the period of major organogenesis:

2-10 weeks of pregnancy

Spontaneous abortion after irradiation during the first 2 weeks of pregnancy is more pronounce at radiation doses of:

Greater than 5000 rad

A radiation source has an exposure rate of 250 mR/hr at 1 m. If a worker stays at 50 cm, he will be exposed to a rate of ________.

1 R/hr

If the same worker opted to stay at 1 m and remained there for 30 min, his total exposure is ____.

125 mR

Positron emitters are generally produced by _________.

Cyclotron

The dose of radiation that will produce twice the frequency of genetic mutation as would have been observed without the radiation.

Doubling dose

Which of the following statement is true about genetic effects?

The frequency of radiation induced mutations is directly proportional to dose

A radiation scientist, engineer, or doctor concerned with the research, teaching, or operational aspect of radiation safety.

Health Physicist

A lateral skull radiograph is obtained at 64 kVp 80 mAs and results in a skin dose of 400 mrad. If the tube voltage is increased to 74 kVp and the mAs reduced to 40 mAs, the new skin dose will be _______.

267 mrad

Crystals that readily absorbs moisture are classified ras ___.

Hygroscopic

This type of detector uses a quenching agent.

GM counter

Which is not classified as non-ionizing radiation?

X-ray

Film badge are not able to measure exposures that are ___.

Less than 10 mR

The length of the exposure cord on a portable x-ray unit must be at least ___.

1.8 meter

Crystals that emit light when heated following exposure to radiation are called ________.

Thermoluminescent

What is the annual effective dose equivalent limit recommendation for whole body exposure of occupational workers?

5 rem

Which of the following affect the average photon energy, thus affecting patient exposure dose? 1. kVp 2. mA 3. generator phase

1 & 3 only

Which of the following can be used as personnel monitoring devices? 1. Thermoluminescent dosimeter 2. Film badge 3. Digital dosimeter A. 1 & 2 only B. 1 & 3 only C. 2 & 3 only D. 1, 2, & 3

1, 2, & 3

Which of the following would penetrate most into tissue? A. X-rays B. Electrons C. Neutrons D. Alpha particles

Neutrons

What is the approximate dose required to produce permanent female sterility? A. 2 to 3 Gy B. 5 to 6 Gy C. 8 to 10 Gy D. 18 to 20 Gy

8 to 10 Gy

Which of the following technical factors would result in the lowest patient exposure dose?

92 kVp, 3 mAs, 400 relative film/screen speed

Which of the following is used to describe current loss in the core of a transformer due to lagging AC magnetization?

Hysteresis loss

Which of the following can be used to indicate exposure rate? 1. R/min 2. mrem/hr 3. Sv/hr

1, 2, & 3

If the intensity of the radiation beam at 40” is 1.1 R, what will be its intensity at 72”?

340 mR

The number of protons ultimately determines the chemical behavior of an atom.

True

The latent period for gastrointestinal syndrome is:

3-5 days

What particle is accountable for annihilation?

Positron

The threshold energy for Pair Production to takes place is: 1. 1.02 meV 2. 1, 022, 000 eV 3. 1, 022 keV

2 and 3 only

Red has a/an __ wavelength (than) violet.

Longer

Indigo has lesser __ than violet.

Energy

Which of the following particles is least likely to be stable?

Neutron

The proponent of relativistic theory:

Albert Einstein

Which of the following electromagnetic radiation behaves as particle? 1. Ultraviolet light 2. X-ray 3. Radiowave

1,2 and 3

Region in electromagnetic spectrum that is used as illuminator.

Visible Light

Corpuscular radiation which has no electric charge.

Neutron

Interaction/s of x-ray with matter that changes not the wavelength: 1. Unmodified Scattering 2. Thomson Scattering 3. Rayleigh Scattering

1, 2, and 3

What does Compton Effect contribute to the radiograph? 1. Contrast 2. Density 3. Latent Image

2 only

Classical scattering involves the emission of:

Neither

Radioactive decay that changes the atomic mass number: 1. Negatron Emission 2. Positron Emission 3. Alpha Emission a. 1 only b. 2 only c. 3 only d. 1, 2, and 3

3 only

Radiofrequency has an utmost importance to:

Magnetic Resonance Imaging

The relationship of energy and frequency of electromagnetic radiation was shown by:

Max Planck

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