Brachytherapy and Radioisotopes Overview

Flashcards covering key concepts related to brachytherapy, isotopes, and their properties.

What are isotopes?

Atoms that have the same number of protons within the nucleus but have different numbers of neutrons.

What is Brachytherapy?

A type of radiation therapy where sources are placed close to or directly in the target volume.

What does HDR stand for in brachytherapy?

High Dose Rate.

What is the decay constant?

A value that describes the rate at which a radioactive source decays.

What is the half-life of Iodine-125?

59.4 days.

What protective measures are necessary when handling Iodine-131 therapy patients?

Wear gloves, wear dosimeters, and ensure the residual isotope is returned to a shielded container.

What is required for the disposal of radioactive materials?

Must follow State and Federal regulations, wear protective gear, and hold the material for 10 half-lives.

What isotopes are commonly used for permanent implants in brachytherapy?

Gold-198, Palladium-103, Iodine-125.

What is the exposure rate equation?

X = exposure rate, d = distance from source to point of calculation, A = source activity.

What types of applicators are used for surface lesions?

External applicators or molds.