Related Experiment Video
Updated: Jul 26, 2026
13:04
Measuring the Subjective Value of Risky and Ambiguous Options using Experimental Economics and Functional MRI Methods
Published on: September 19, 2012
From mechanisms to risk estimation--bridging the chasm
S B Curtis1, W D Hazelton, E G Luebeck
1Fred Hutchinson Cancer Research Center, Seattle, WA 98109-1024, USA. sbcurtis@fhcrc.org
Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|May 11, 2005
Summary
Developing mechanistic models is crucial for accurately estimating radiation risk. New findings suggest protracted radiation exposure, even at low doses, may pose a greater cancer risk than acute exposure, challenging current radiation protection beliefs.
Area of Science:
- Radiation biology
- Cancer research
- Risk assessment
Background:
- Current radiation risk models need improvement by incorporating sub-cellular, cellular, and tissue biology.
- Mechanistic models are needed to understand specific health effects like carcinogenesis.
Purpose of the Study:
- To develop and apply a multi-stage carcinogenic model incorporating biological information to estimate radiation risk.
- To investigate the impact of dose rate and radiation quality on carcinogenesis.
Main Methods:
- Utilized a multi-stage carcinogenic model applied to lung cancer incidence and mortality data.
- Reviewed data from two exposed populations for both high- and low-Linear Energy Transfer (LET) radiation.
Main Results:
- Evidence of an "inverse dose-rate" or protraction effect for both high- and low-LET radiation.
- Radiation-induced initiation may not be the primary driver of risk; effects on already-initiated cells could be more significant.
- Bystander effects and radiation quality (LET) may influence carcinogenesis stages.
Conclusions:
- Protracted low-dose radiation exposure might carry a higher risk than acute exposure, contrary to current radiation protection views.
- Radiation-induced initiation's role in cancer risk is likely age-dependent and more pronounced later in life.
- Further research, including animal studies, is needed to understand radiation effects in the context of space radiation environments.
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