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Questions and Answers
What is exposure?
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?
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?
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?
What is exposure rate?
In radiation protection, what is the common way to indicate exposure rate values?
In radiation protection, what is the common way to indicate exposure rate values?
What is absorbed dose?
What is absorbed dose?
What is the most frequently used quantity for patient dosimetry in mammography?
What is the most frequently used quantity for patient dosimetry in mammography?
How can ESAK be determined for mammography?
How can ESAK be determined for mammography?
Which dosimetric quantity is used for computed tomography?
Which dosimetric quantity is used for computed tomography?
What type of dosimeter is seen on the image due to the low kV used?
What type of dosimeter is seen on the image due to the low kV used?
What should be applied to Entrance Surface Dose measured with the TLD to express ESAK?
What should be applied to Entrance Surface Dose measured with the TLD to express ESAK?
What is the dynamic range required for a radiation dosimeter used for mammography?
What is the dynamic range required for a radiation dosimeter used for mammography?
What should be the HVL (Half Value Layer) for determining ESAK?
What should be the HVL (Half Value Layer) for determining ESAK?
What is the dosimetric quantity used for expressing compliance with reference dose level?
What is the dosimetric quantity used for expressing compliance with reference dose level?
What is the SI unit of absorbed dose?
What is the SI unit of absorbed dose?
How can absorbed dose in a material be calculated when exposure is known?
How can absorbed dose in a material be calculated when exposure is known?
What is equivalent dose?
What is equivalent dose?
What does effective dose combine?
What does effective dose combine?
What does entrance surface dose (ESD) refer to?
What does entrance surface dose (ESD) refer to?
What is dose area product (DAP)?
What is dose area product (DAP)?
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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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