Ionizing Radiation Exposure Quiz

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Questions and Answers

What is exposure?

The energy absorbed per unit mass

The SI unit for exposure rate

The absolute value of the total charge of the ions of one sign produced in air

The ability of the radiation to produce ionization in air (correct)

What is the SI unit of exposure?

R/s

Roentgen [R]

C/kg per second

Coulomb per kilogram [C kg-1] (correct)

What is the former special unit of exposure?

Coulomb per kilogram [C kg-1]

C/kg per second

R/s

Roentgen [R] (correct)

What is exposure rate?

The exposure produced per unit of time Signup and view all the answers

In radiation protection, what is the common way to indicate exposure rate values?

Per hour (e.g. R/h) Signup and view all the answers

What is absorbed dose?

The energy absorbed per unit mass Signup and view all the answers

What is the most frequently used quantity for patient dosimetry in mammography?

Entrance Surface Air Kerma (ESAK) Signup and view all the answers

How can ESAK be determined for mammography?

Using a TLD dosimeter calibrated in terms of air kerma free-in-air at a HVL as close as possible to 0.4 mm Al with a standard phantom Signup and view all the answers

Which dosimetric quantity is used for computed tomography?

CTDI (Computed Tomography Dose Index) Signup and view all the answers

What type of dosimeter is seen on the image due to the low kV used?

Thermoluminescent dosimeter (TLD) Signup and view all the answers

What should be applied to Entrance Surface Dose measured with the TLD to express ESAK?

Appropriate backscatter factor Signup and view all the answers

What is the dynamic range required for a radiation dosimeter used for mammography?

Covering at least 0.5 to 100 mGy Signup and view all the answers

What should be the HVL (Half Value Layer) for determining ESAK?

As close as possible to 0.4 mm Al Signup and view all the answers

What is the dosimetric quantity used for expressing compliance with reference dose level?

ESAK Signup and view all the answers

What is the SI unit of absorbed dose?

Gray (Gy) Signup and view all the answers

How can absorbed dose in a material be calculated when exposure is known?

With a conversion coefficient (f) Signup and view all the answers

What is equivalent dose?

The absorbed dose multiplied by a radiation weighting factor (wR) Signup and view all the answers

What does effective dose combine?

The detriment of radiation exposure to different organs and tissues Signup and view all the answers

What does entrance surface dose (ESD) refer to?

The absorbed dose in soft tissue or water Signup and view all the answers

What is dose area product (DAP)?

The absorbed dose in air in a plane, integrated over the area of interest Signup and view all the answers

Study Notes

The SI unit of absorbed dose is the Gray (Gy), with 1 Gy equal to 1 J/kg and 100 rad.
Absorbed dose in a material can be calculated when exposure is known, with a conversion coefficient (f) depending on the medium.
Mean absorbed dose in a tissue or organ is the energy deposited in the organ divided by its mass.
Equivalent dose is the absorbed dose multiplied by a radiation weighting factor (wR), expressing the biological effectiveness of a given type of radiation.
Effective dose combines the detriment of radiation exposure to different organs and tissues, with each organ's equivalent dose multiplied by its tissue weighting factor.
Entrance surface dose (ESD) refers to the absorbed dose in soft tissue or water, and its relation to absorbed dose in air depends on the mass energy coefficient of the medium.
Dose area product (DAP) is the dose in air in a plane, integrated over the area of interest, and is a constant with distance under certain conditions.
Average glandular dose (AGD) is the dosimetry quantity recommended for risk assessment in mammography, and is derived from measurements with the standard phantom for the actual technique setup.

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Description

Test your knowledge about the dosimetric quantity for ionizing radiation known as exposure. Learn about the measurement based on the ability of radiation to produce ionization in air and its significance in radiation units and dose quantities.