Introduction to Radiology and Radiation Quantities

Vocabulary practice flashcards generated from radiology lecture transcripts covering radiation dose limits, historical discoveries, key personnel, radiologic quantities, and unit conversion pairs.

Wilhelm Roentgen

A German physicist who discovered X-rays in November 1895, created the first X-ray image in December 1895, and won the Nobel Prize in physics in December 1901. The radiation unit Roentgen ($\text{R}$) is named in his honor.

Anna Bertha Ludwig

The wife of Wilhelm Roentgen who was the subject of the first X-ray image on December 22, 1895, depicting her left hand.

Thomas Alva Edison

The inventor of the light bulb who is credited with designing and producing the Fluoroscope, a machine that uses X-rays.

Clarence Dally

Assistant to Thomas Edison who suffered from severe radiation exposure, almost lost his eyesight, and became the first human death resulting from X-rays.

Sir William Crooke

Creator of the Crookes Tube in 1870, which was used to study electrical discharges, leading to the discovery of the electron and paving the way for X-rays.

Fluoroscope

A machine designed and produced by Thomas Edison that utilizes X-rays, which was also fitted for shoe fitting in 1919.

ALARA

The cardinal rule of radiation safety and protection.

Absorbed Dose

A radiologic quantity measured in Rad or Gray ($\text{Gy}$).

Equivalent Dose

A radiologic quantity measured in Rem or Sievert ($\text{Sv}$).

Radioactivity

A radiologic quantity discovered by Henry Becquerel and measured in Curie ($\text{Ci}$) or Becquerel ($\text{Bq}$).

Roentgen ($\text{R}$)

The unit of radiation exposure named in honor of Wilhelm Roentgen, paired with coulombs per kilogram ($\text{C/kg}$) in SI units.

Marie Curie

The scientist after whom the traditional unit of radioactivity measure, Curie ($\text{Ci}$), is named.

Henry Becquerel

The scientist who discovered radioactivity, after whom the SI unit Becquerel ($\text{Bq}$) is named.

Fundamental Quantities

The core physical measurements consisting of mass, length, and time.

Derived Quantities

Physical quantities derived from fundamental measurements, including momentum, acceleration, power, and force.

Radiologic Quantities

The specific set of radiation measurements comprising dose, exposure, and radioactivity.

Lead Aprons

Protective apparel requiring a lead thickness of $0.5\,\text{mm}$.

Leaded Wall

A protective shielding wall with a height of $7\,\text{ft}$ and lead thickness specified as $1\,\text{m} - 3.5\,\text{mm}$.

Human Brain (Physiological Facts)

An organ weighing $3\,\text{lbs}$, representing $2\,\%$ of total body weight, and consisting of $60\,\% - 80\,\%$ water.

Whole Body Occupational Dose Limit

The maximum permissible annual radiation dose limit for the whole body, set at $5\,\text{rem}$ ($5,000\,\text{mrem}$).

Lens of Eye Occupational Dose Limit

The maximum permissible annual radiation dose limit for the lens of the eye, set at $15\,\text{rem}$.

Extremity & Skin Occupational Dose Limit

The maximum permissible annual radiation dose limit for extremities and skin, set at $50\,\text{rem}$.

Embryo / Fetus Dose Limit

The maximum permissible radiation dose limit for an embryo or fetus, set at $0.5\,\text{rem}$ ($500\,\text{mrem}$).

Minor Occupational Dose Limit

The maximum permissible annual radiation dose limit for individuals under $18$ years of age, set at $0.5\,\text{rem}$ ($500\,\text{mrem}$).

General Public Dose Limit

The maximum permissible annual radiation dose limit for members of the general public, set at $0.1\,\text{rem}$ ($100\,\text{mrem}$).

Maximum Permissible Annual Dose Chart

A summary table specifying the maximum annual radiation dose limits for occupational exposure across different regions of the body as well as for minors and the general public.

Radiation Unit Conversion Pairs Chart

A reference guide pairing traditional radiation units with their corresponding SI units: Roentgen (R) to C/kg, Rad to Gray (Gy) for absorbed dose, Rem to Sievert (Sv) for equivalent dose, and Curie (Ci) to Becquerel (Bq) for radioactivity.