Radiological P6 Chapter 1-3 Part 2

1 Ci is equivalent to how many atoms disintegrating every second?

• a. 3 x 10^8
• b. 3 x 10^10
• c. 3.7 x 10^8
• d. 3.7 x 10^10
• e. 2.2 X 10^12

How many half-lives must elapse before the remaining activity is less than 0.1% of the original activity?

• a. 4 half-lives
• b. 6 half-lives
• c. 8 half-lives
• d. 10 half-lives
• e. 12 half-lives

Which of the following statements about a given radioisotope is true?

• a. As the number of atoms decreases, the halflife decreases.
• b. The half-life increases as the decay constant increases.
• c. The number of radioactive atoms decreases linearly with time.
• d. The percentage of atoms decaying per unit of time decreases.
• e. The percentage of atoms decaying per unit of time is constant.

The shape of the radioactive decay curve is:

• a. A concave-down curve on linear paper.
• b. A concave-up curve on semilog paper.
• c. A straight line on linear paper.
• d. A straight line on semilog paper.
• e. Linear and nonthreshold.

Of the following radiations, the most penetrating is a:

• a. 10 keV x-ray.
• b. 100 keV gamma ray.
• c. 0.01 MeV x-ray.
• d. 2.1 MeV beta particle.
• e. 4.8 MeV alpha particle

A photon having energy of approximately 1 eV is most likely:

• a. A gamma ray.
• b. A radio emission.
• c. An x-ray.
• d. Therapeutic ultrasound.
• e. Visible light.

When white light is refracted through a prism, the following colors are emitted. Which has the longest wavelength?

• a. Blue
• b. Orange
• c. Red
• d. Ultraviolet
• e. Yellow

Which of the following types of radiation would be classified as electromagnetic?

• a. 5 MHz therapeutic ultrasound
• b. 30 m radio broadcast
• c. 1000 Hz sound
• d. Beta radiation
• e. Heat convected from a radiator

Which of the following is not a characteristic of the wave model of radiation?

• a. Collision
• b. Deflection
• c. Reflection
• d. Refraction
• e. Transmission

At what level should visible light interact most readily?

• a. Atomic
• b. Molecular
• c. Nucleon
• d. Organ
• e. Tissue