Deterministic Effects of Radiation

This set of flashcards covers key concepts related to the deterministic effects of radiation, including definitions of terms, conditions resulting from radiation exposure, and details on the effects of radiation on human health and biology.

Deterministic Effect

A radiation response that exhibits increasing severity with increasing radiation dose, having a threshold and a nonlinear dose-response relationship.

Sentinel event

An unanticipated event in a healthcare setting resulting in death or serious physical or psychological injury to a patient, not related to the natural course of the patient's illness.

Acute Radiation Lethality

No recording of death following diagnostic x-rays; high doses are necessary to cause death, generally not seen in diagnostic procedures.

Prodromal Period

The immediate response when symptoms occur within minutes to hours after exposure, severity related to dose.

Latent Period

A period of apparent well-being after initial radiation sickness, mistakenly seen as early recovery.

LD50/60

The dose required to the whole body that causes 50% of irradiated subjects to die within 60 days.

Hematologic syndrome

A condition resulting from whole-body exposure to radiation, leading to a depression in blood cell numbers.

Gastrointestinal syndrome

Occurs with doses of 10 to 50 Gyt, leads to violent diarrhea and loss of appetite, resulting in severe damage to intestinal linings.

CNS syndrome

Affects central nervous system function after exposure to doses above 50 Gyt, leading to severe symptoms and inevitable death.

Skin erythema

Reddening of the skin similar to sunburn, can occur with doses around 3-10 Gyt.

Epilation

Loss of hair, which can occur due to radiation exposure; high doses of low-energy X-rays can cause permanent hair loss.

Spleen and Thymus

Organs that produce lymphocytes, which are vital to the immune response and are sensitive to radiation.

Chromosome aberration

Severe damage to DNA where nearly every type of aberration can be induced by radiation, with effects dependent on the dose.

Single-Hit Chromosome Aberration

A type of aberration resulting from irradiation that causes chromatid breaks, detectable in cellular divisions.

Multi-Hit Chromosome Aberrations

Aberrations that involve multiple hits and require karyotypic analysis for detection, such as ring and dicentric formations.