PHYS 3330 Module 1.1

Quantities and Units

Recommended Reading

1.1 Quantities and UnitsDownload

Learning Objectives

By the end of this section, you will be able to:

  • Calculate and convert between different units of energy, power, and frequency.
  • Apply electrical units to understand and analyze the operation of medical devices.
  • Utilize radiation units to assess and ensure proper dosages in medical treatments.

Quantities and Units

Practice!

Practice 1.1.1
A patient is given an x-ray exposure of 200 R. What is this exposure in C/kg?
Check your answer: A) 0.0516 C/kg
Practice 1.1.2
A source of cobalt-60 with a half-life of 5.2 years has an activity of 1100 Ci. What is this activity expressed in becquerels (Bq)?
Check your answer: D) 4.07 × 10^13 Bq
Practice 1.1.3
What is the kinetic energy of an electron accelerated through a potential difference of 400 kV?
Check your answer: A) 400 keV
Practice 1.1.4
What is the kinetic energy of an electron accelerated through a potential difference of 400 kV?
Check your answer: B) 6.4 × 10^-14 J
Practice 1.1.5
A patient receives a radiation therapy treatment that delivers an absorbed dose of 2 Gy to a tumor. What is this dose expressed in both rad and J/kg?
Check your answer: C) 200 rad, 2 J/kg