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Updated: Jun 11, 2026

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation

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Published on: July 3, 2015

The dose window for radiation-induced protective adaptive responses.

Ronald E J Mitchel¹

¹Radiation Protection Research and Instrumentation Branch, Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, ON Canada.

Dose-Response : a Publication of International Hormesis Society

|June 30, 2010

Summary

Low doses of low-linear energy transfer (LET) radiation trigger adaptive responses in organisms, protecting against DNA damage and related diseases. However, this protective window has variable thresholds influenced by dose rate, stressors, tissue type, and p53 status.

Keywords:

adaptive response dose-threshold low-dose radiation risk

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Last Updated: Jun 11, 2026

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation

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Published on: July 3, 2015

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Area of Science:

Radiobiology
Cellular and Molecular Biology
Genetics

Background:

Adaptive responses to low doses of low-linear energy transfer (LET) radiation are observed across diverse organisms, from single-celled eukaryotes to mammals.
These responses mitigate harmful effects of DNA damage, including radiation-induced or spontaneous cancers and non-cancer diseases.

Purpose of the Study:

To define the dose thresholds and influencing factors of the adaptive response in mammalian cells and organisms.
To understand the variability of protective mechanisms against radiation exposure.

Main Methods:

Review of existing literature on adaptive responses to low-dose radiation.
Analysis of factors influencing adaptive response thresholds, including dose rate, co-stressors, tissue type, and p53 functional status.

Main Results:

The adaptive response in mammals operates within a specific dose window, typically 1-100 mGy for single low dose rate exposures.
Thresholds for protection are not fixed and depend on dose rate, additional stressors, tissue type, and p53 status.
Exposures exceeding the upper threshold are detrimental, while those below the lower threshold may not confer protection and could potentially increase disease risk.

Conclusions:

The adaptive response to low-dose radiation is a complex phenomenon with variable protective windows.
Understanding these variable thresholds is crucial for accurately assessing radiation risks and developing protective strategies.
Further research is needed to fully elucidate the mechanisms and practical implications of adaptive responses in different biological contexts.