Related Experiment Video
Updated: Aug 10, 2026
09:19
In Situ Monitoring of the Accelerated Performance Degradation of Solar Cells and Modules: A Case Study for Cu(In,Ga)Se2 Solar Cells
Published on: October 3, 2018
Issues in risk assessment from solar particle events
1NASA, Johnson Space Center, Houston, TX 77058, USA.
Radiation Measurements
|September 7, 2001
Summary
New knowledge is needed to accurately assess radiation risks from solar particle events (SPEs). Understanding secondary ion effects and dose-rate impacts is crucial for spaceflight safety.
Area of Science:
- Space science and radiation biology.
- Radiation protection and risk assessment.
Background:
- Solar particle events (SPEs) pose significant radiation risks during spaceflight.
- Current risk assessments have uncertainties regarding secondary ion effects, dose-rate impacts, cancer mortality, and spaceflight stress.
Purpose of the Study:
- To identify key areas requiring new knowledge for improved SPE radiation risk estimation.
- To discuss factors influencing radiation response, including secondary particles and dose-rate effects.
Main Methods:
- Reviewing uncertainties in radiation risk assessment for SPEs.
- Discussing the role of high linear energy transfer (LET) secondary ions and low energy and charge (LZE) ions.
- Considering dose-rate effects, genetic predisposition, and molecular pathways.
- Utilizing radiation transport codes, track structure models, and molecular kinetics for analysis.
Main Results:
- Secondary particles (neutrons, LZE ions) may be the dominant risk factor behind storm shelters.
- Biological effects of secondary particles, especially at low dose-rates, are poorly understood.
- Dose-rate modulation of radiation response is influenced by genetic predisposition.
- Recent advances in molecular pathways offer potential for better understanding dose-rate effects.
Conclusions:
- Improved SPE risk assessment requires addressing uncertainties in secondary particle biology and dose-rate effects.
- Integrating advanced modeling techniques (radiation transport, track structure, molecular kinetics) is essential.
- Further research into the biological impact of low dose-rate radiation is critical for astronaut safety.
Keywords:
NASA Discipline Radiation Health
Related Concept Videos
01:08The Availability Heuristic
A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):
02:59Biological Effects of Radiation
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:09Radiation Pressure: Problem Solving
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
01:23Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
01:27Psychoneuroimmunology: Cardiovascular Disease
Psychoneuroimmunology (PNI) is a multidisciplinary field that examines how psychological factors, particularly stress, interact with the immune system and impact physical health. Research in PNI has shown that chronic or traumatic stress can disrupt both the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system. These disruptions contribute to serious health conditions, including cardiovascular diseases.
A key area of focus in PNI is the relationship between stress and coronary...
A key area of focus in PNI is the relationship between stress and coronary...