Stochastic and Deterministic Effects of Radiation Exposure

Flashcards covering the definitions, characteristics, and specific threshold doses for stochastic and deterministic effects of radiation.

Into which two categories can all damaging effects of radiation be organized?

Stochastic effects and deterministic effects.

What does the term 'stochastic' mean in the context of radiation effects?

Random and unpredictable.

What is the only significant stochastic effect mentioned in the transcript?

Cancer.

Why are stochastic effects also called 'probabilistic effects'?

Whether or not these effects happen is based purely on probability or chance.

What is a 'non threshold effect' in radiation exposure?

An adverse response that can occur as a result of any dose of radiation, meaning there is no known minimum threshold dose.

How does the increase in radiation dose affect stochastic effects?

As exposure increases, the probability of acquiring the effect increases, but the severity remains unaffected by the dose.

How is the severity of a stochastic effect, such as cancer, related to the radiation dose?

The severity is not affected by the dose; a cancer caused by a small dose is no different than one caused by a larger dose.

What are 'deterministic effects' of radiation?

Predictable effects that occur only when specific dose thresholds are reached.

What are three alternative names for deterministic effects?

Nonstochastic effects, tissue reactions, and threshold effects.

At what radiation dose threshold does a diminished sperm count occur?

$100\,mGy$ or higher.

What is the specific dose threshold required for skin erythema to occur?

An acute dose of at least $2000\,mGy$.

At what radiation dose does epilation occur?

$3000\,mGy$ or higher.

How does the severity of deterministic effects relate to the radiation dose?

The severity of the illness depends on and increases with the dose.

What are four examples of deterministic effects mentioned in the lesson?

Cataracts, skin erythema, epilation, and decreased sperm count (or acute radiation syndrome).