PHYSICS FOR MEDICAL RADIATION
- EXAM 1 QUESTIONS WITH
COMPLETE SOLUTIONS
Physics correct answer: The science of space, time, matter, energy and their interactions at the most fundamental level.
Time correct answer: Dimension that relates to when events occur.
Matter correct answer: Anything that occupies space and has mass.
Energy correct answer: The ability to do work
Medical Radiations/Radiology correct answer: The application of different types of radiation to the diagnosis and treatment of disease. Radiation is the energy that is emitted and transferred through space.
What are the specialties within Medical Imaging? correct answer: - Radiography - X-rays to produce images. - Computed Tomography: A rotating X-ray beam to image "slices" of the body. - Magnetic Resonance Imaging: Strong magnetic field and radio waves to image the body. - Medical Sonography: reflected sound waves to produce images
of organs and tissues in the body. - Nuclear Med: administrating trace amounts of a radioactive substance to a patient and detecting emitted radiation to form a body part.
Radiation Therapy correct answer: The use of targeted doses of radiation to a patient's body to treat cancer.
Accuracy correct answer: How close a measured or calculated quantity is to the actual or true value.
Precision correct answer: The extent to which repeated measurements give the same value Precision is indicated by its significant figures - When adding or subtracting: the decimal places of the least number of decimal places is used
- When multiplying or dividing: rounded to the number with least number of significant figures.
Direct proportionality correct answer: If x increases, Y will increase in direct proportion.
Slope equation correct answer: Change in Y/Change in X
Inversely proportionality correct answer: If X increases, Y decreases in proportionality
What are the three most fundamental qualities within physics? correct answer: Length (m), Mass (kg) and Seconds (s) What is the fundamental unit for length (metres) based on? correct answer: The speed of light
What is the fundamental unit for mass (kilogram) based on? correct answer: The metal cylinder kept on Paris
What is the fundamental unit for time (seconds) based on? correct answer: The vibration of Cesium atom
What are the other SI units? correct answer: Ampere - Electrical
current Kelvin - Temperature Mol - amount of substance Candela - Luminous intensity
Derived quantities and units correct answer: Area: Square meter
(m^2) Volume: Cubic meter (m^3) Velocity: Meter per second (m/s)
Electric charge: Coulomb (C) Potential difference & emf: Voltage (V)
Energy: Joule (J)
Tera (T) correct answer: 10^12
Giga (G) correct answer: 10^9
Mega (M) correct answer: 10^6
Kilo (K) correct answer: 10^3 Deci (D) correct answer: 10^-1
Centi (C) correct answer: 10^-2
Milli (m) correct answer: 10^-3
Micro (mu) correct answer: 10^-6
Nano (n) correct answer: 10^-9
Pico (p) correct answer: 10^-12
Activity correct answer: Activity is the number of disintegrations per seconds. Atomic nuclei can be radioactive and disintegrate by emitting alpha, beta or gamma particles. Unit: disintegration per second = Becquerels (Bq) (Old unit was curie, Ci)
Exposure correct answer: An ionising radiation is radiation that has sufficient energy to ionise This is divided into Particulate radiation (neutrons, electrons, alpha + beta) and electromagnetic radiation (X-rays and Y-rays) Exposure is only for electromagnetic radiation and calculates the
amount of electric charge liberated per unit mass of air. Unit: Coulomb per kilogran (C/kg) (old unit: roentgen)
- EXAM 1 QUESTIONS WITH
COMPLETE SOLUTIONS
Physics correct answer: The science of space, time, matter, energy and their interactions at the most fundamental level.
Time correct answer: Dimension that relates to when events occur.
Matter correct answer: Anything that occupies space and has mass.
Energy correct answer: The ability to do work
Medical Radiations/Radiology correct answer: The application of different types of radiation to the diagnosis and treatment of disease. Radiation is the energy that is emitted and transferred through space.
What are the specialties within Medical Imaging? correct answer: - Radiography - X-rays to produce images. - Computed Tomography: A rotating X-ray beam to image "slices" of the body. - Magnetic Resonance Imaging: Strong magnetic field and radio waves to image the body. - Medical Sonography: reflected sound waves to produce images
of organs and tissues in the body. - Nuclear Med: administrating trace amounts of a radioactive substance to a patient and detecting emitted radiation to form a body part.
Radiation Therapy correct answer: The use of targeted doses of radiation to a patient's body to treat cancer.
Accuracy correct answer: How close a measured or calculated quantity is to the actual or true value.
Precision correct answer: The extent to which repeated measurements give the same value Precision is indicated by its significant figures - When adding or subtracting: the decimal places of the least number of decimal places is used
- When multiplying or dividing: rounded to the number with least number of significant figures.
Direct proportionality correct answer: If x increases, Y will increase in direct proportion.
Slope equation correct answer: Change in Y/Change in X
Inversely proportionality correct answer: If X increases, Y decreases in proportionality
What are the three most fundamental qualities within physics? correct answer: Length (m), Mass (kg) and Seconds (s) What is the fundamental unit for length (metres) based on? correct answer: The speed of light
What is the fundamental unit for mass (kilogram) based on? correct answer: The metal cylinder kept on Paris
What is the fundamental unit for time (seconds) based on? correct answer: The vibration of Cesium atom
What are the other SI units? correct answer: Ampere - Electrical
current Kelvin - Temperature Mol - amount of substance Candela - Luminous intensity
Derived quantities and units correct answer: Area: Square meter
(m^2) Volume: Cubic meter (m^3) Velocity: Meter per second (m/s)
Electric charge: Coulomb (C) Potential difference & emf: Voltage (V)
Energy: Joule (J)
Tera (T) correct answer: 10^12
Giga (G) correct answer: 10^9
Mega (M) correct answer: 10^6
Kilo (K) correct answer: 10^3 Deci (D) correct answer: 10^-1
Centi (C) correct answer: 10^-2
Milli (m) correct answer: 10^-3
Micro (mu) correct answer: 10^-6
Nano (n) correct answer: 10^-9
Pico (p) correct answer: 10^-12
Activity correct answer: Activity is the number of disintegrations per seconds. Atomic nuclei can be radioactive and disintegrate by emitting alpha, beta or gamma particles. Unit: disintegration per second = Becquerels (Bq) (Old unit was curie, Ci)
Exposure correct answer: An ionising radiation is radiation that has sufficient energy to ionise This is divided into Particulate radiation (neutrons, electrons, alpha + beta) and electromagnetic radiation (X-rays and Y-rays) Exposure is only for electromagnetic radiation and calculates the
amount of electric charge liberated per unit mass of air. Unit: Coulomb per kilogran (C/kg) (old unit: roentgen)
