Morphological changes in neutron irradiated red blood cells.

Area of Science:

• Biophysics
• Radiation Biology
• Hematology

Background:

• Red blood cells (erythrocytes) are crucial for oxygen transport.
• Understanding the effects of radiation on cellular morphology is vital for radiation protection and medical applications.
• Thermal neutron irradiation presents a unique challenge due to its biological interactions.

Purpose of the Study:

• To investigate the morphological changes in living human red blood cells following thermal neutron irradiation.
• To characterize the dose-dependent and time-dependent effects of thermal neutrons on erythrocyte shape transformation.
• To determine the relative biological effectiveness (RBE) of thermal neutrons on red blood cells.

Main Methods:

• Living human red blood cells were exposed to thermal neutron beams at the MIT Nuclear Reactor.
• Irradiation doses ranged from 0 to 75 Gray, with a dose rate of 5 Gray per hour.
• Scanning electron microscopy was used to examine cellular morphology at 10, 48, and 96 hours post-irradiation.

Main Results:

• A four-stage transformation from discoid to spheroid shape was observed in neutron-irradiated red blood cells.
• Radiation dose induced a dose-dependent shift from Stage 1 to Stage 2 of transformation.
• Transformation rate constants increased with radiation dose, indicating accelerated cellular changes.

Conclusions:

• Low-dose thermal neutron irradiation causes significant morphological alterations in human red blood cells.
• The observed pronounced effects suggest a high relative biological effectiveness (RBE) for thermal neutrons.
• These findings highlight the sensitivity of erythrocytes to neutron radiation and inform radiation biology research.