Related Experiment Video
Updated: Jan 30, 2026
09:28
Evaluation of the Spatial Distribution of γH2AX following Ionizing Radiation
Published on: August 7, 2010
13.2K
Ionizing radiation and bone quality: time-dependent effects.
Pedro Henrique Justino Oliveira Limirio1, Priscilla Barbosa Ferreira Soares1, Eduardo Tadashi Pinto Emi1
1Integrated Dental Clinic Program, Faculty of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38.400-902, Brazil.
Radiation Oncology (London, England)
|January 24, 2019
Summary
Ionizing radiation (IR) negatively impacts rat bone quality and stiffness. These detrimental effects on bone structure worsen over time, as observed 60 days post-irradiation.
Area of Science:
- Biomedical Engineering
- Radiology
- Orthopedics
Background:
- Ionizing radiation (IR) exposure can significantly affect bone tissue.
- Understanding the long-term skeletal consequences of IR is crucial for patient management.
Purpose of the Study:
- To investigate the effects of a single 30 Gy dose of ionizing radiation on rat bone quality and biomechanical properties at 30 and 60 days post-irradiation.
Main Methods:
- Wistar rats received IR (30 Gy) to the left leg.
- Bone samples were analyzed using CT, histomorphometry, lacunarity analysis, ATR-FTIR, and biomechanical testing at 30 and 60 days.
- Control (non-irradiated) and irradiated groups were compared at both time points.
Main Results:
- CT scans revealed increased radiodensity in older samples and irradiated samples over time.
- Histomorphometric and lacunarity analyses indicated changes in bone matrix and structure.
- ATR-FTIR and Crystallinity Index showed alterations in collagen cross-linking and mineral content.
- Biomechanical testing demonstrated reduced bone stiffness in irradiated limbs.
Conclusions:
- Ionizing radiation significantly impairs bone quality and reduces stiffness.
- The negative effects of IR on bone are progressive, becoming more pronounced at later time points (60 days).
Related Concept Videos
02:59Biological Effects of Radiation
17.9K
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...
17.9K
03:12Ionization Energy
43.3K
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
43.3K
01:20Chronopharmacokinetics: Time-Dependent Pharmacokinetics
411
Chronopharmacokinetics studies the temporal change in drug absorption and elimination. These changes can be cyclical or non-cyclical. Cyclical changes occur over a regular interval, while non-cyclical changes occur over a longer, irregular period.
Time-dependent pharmacokinetics refers to non-cyclical changes in drug rate processes over a period of time. It can lead to nonlinear pharmacokinetics, where the relationship between drug concentration and time is not proportional. Non-cyclical...
Time-dependent pharmacokinetics refers to non-cyclical changes in drug rate processes over a period of time. It can lead to nonlinear pharmacokinetics, where the relationship between drug concentration and time is not proportional. Non-cyclical...
411
02:39The Integrated Rate Law: The Dependence of Concentration on Time
41.4K
While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...
41.4K
01:17Radiation: Applications
1.8K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.8K
01:05Absorption of Radiation
1.3K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.3K