Dosimetry

Dosimetry

Write a short note on dosimetry.
Answer. Radiation dose is measured by dosimetry.

• Dosimetry is the determination of the quantity of radiation exposure or dose.
• Radiation dosimetry deals with the measurement of the absorbed dose or dose rate resulting from the interaction of ionizing radiation with matter and particularly in different tissues of body.

“Understanding the role of dosimetry in radiation safety: Q&A explained”

The following are the various measures of dosimetry:

• Dose: It is the amount of radiation at the given point or the amount of energy absorbed per unit mass at the site of interest.
• Erythema dose (3 to 4 Gy): It is the dose that produces in one sitting a reversible reddening of skin.

“Common challenges in applying dosimetry effectively: FAQs provided”

Radiation dosimetry

• Exposure: It is a measure of radiation quantity, the capacity of the radiation to ionize the air. SI unit of exposure in air is Kerma.
• Absorbed dose: It is the measure of the energy absorbed by any type of ionizing radiation per unit mass of any type of matter.
• Equivalent dose (HT): It is used to compare the biologic effects of different types of radiation to a tissue or organ. It is the sum of absorbed dose averaged over a tissue or organ and the radiation weighting factor.

“Importance of studying dosimetry for better radiation protection: Questions explained”

Types of dosimeters

• Effective dose (E): It is used to estimate the risk in humans. It is the sum of the products of the equivalent dose to each organ or tissue and the tissue weighing factor. Its unit is Sievert (Sv).
• Radioactivity: It describes the decay rate of a sample of radioactive material. Its SI unit is Curie (Ci).
• Maximum permissible dose: It is the equivalent that a person or specified parts of a person shall be allowed to receive in a certain stated time.
• Maximum accumulated dose: This dose indicates the higher limits permitted for occupationally exposed persons do not pertain to individuals under the age of 18, and dental assistants under the age of 18 are limited to the same exposure as the general public, i.e., 0.0005 Sv/year.