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...

Synchrotrons And Accelerators

Accelerators

[early Changes In The Lymphocyte Surface Membrane Of Rats After Whole-body Irradiation With Neutrons And Gamma Rays]

5.0K

09:10

Intestinal Epithelial Regeneration in Response to Ionizing Irradiation

Published on: July 27, 2022

2.7K

11:24

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

Published on: July 3, 2015

11.6K

See more related videos

View abstract on PubMed

Summary

Fast neutrons and gamma-rays significantly alter rat lymphocyte membranes. Neutrons caused greater lipid peroxidation and increased free aminogroups on thymocytes compared to gamma-rays, with dose- and time-dependent effects.

Area of Science:

Radiation biology
Biochemistry
Cellular biology

Background:

Ionizing radiation exposure can induce biochemical alterations in cell membranes.
Lymphocytes, particularly thymocytes, are sensitive targets of radiation damage.
Understanding radiation-induced membrane changes is crucial for assessing biological effects.

Purpose of the Study:

To investigate the biochemical changes in lymphocyte plasma membranes following exposure to neutrons and gamma-rays.
To compare the effects of different radiation types (neutrons vs. gamma-rays) on lipid peroxidation and cell surface aminogroups.
To analyze the dose- and time-dependent responses to radiation with varying Linear Energy Transfer (LET).

Main Methods:

Whole-body exposure of rats to varying doses (2-6 Gy) of fast neutrons and gamma-rays.
Biochemical analysis of lymphocyte plasma membranes at 3 and 18 hours post-irradiation.
Quantification of lipid peroxidation rates.
Measurement of free aminogroup content on thymocyte surfaces.

Main Results:

Fast neutrons (1.5-2.0 MeV) induced a more significant increase in lipid peroxidation compared to gamma-rays.
Both radiation types led to an increase in free aminogroups on the thymocyte surface.
The dose- and time-dependent changes in aminogroup content differed quantitatively between neutron and gamma-ray exposure, reflecting different LET effects.

Conclusions:

Neutrons and gamma-rays exert distinct biochemical effects on lymphocyte membranes.
Neutron radiation appears more potent in inducing lipid peroxidation.
Radiation-induced changes in cell surface aminogroups are dependent on radiation type, dose, and time, highlighting the importance of LET in radiobiology.