Kratko priopćenje
https://doi.org/10.2478/10004-1254-61-2010-1982
Dose Rate Effect of Pulsed Electron Beam on Micronucleus Frequency in Human Peripheral Blood Lymphocytes
Santhosh Acharya
; Microtron Centre, Department of Studies in Physics, Mangalore University, Mangalagangotri, India
Ganesh Sanjeev
; Microtron Centre, Department of Studies in Physics, Mangalore University, Mangalagangotri, India
Nagesh N. Bhat
; Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai, India
Yerol Narayana
; Microtron Centre, Department of Studies in Physics, Mangalore University, Mangalagangotri, India
Sažetak
The micronucleus assay in human peripheral blood lymphocytes is a sensitive indicator of radiation damage and could serve as a biological dosimeter in evaluating suspected overexposure to ionising
radiation. Micronucleus (MN) frequency as a measure of chromosomal damage has also extensively been employed to quantify the effects of radiation dose rate on biological systems. Here we studied the effects of 8 MeV pulsed electron beam emitted by Microtron electron accelerator on MN induction at dose rates
between 35 Gy min-1 and 352.5 Gy min-1. These dose rates were achieved by varying the pulse repetition rate (PRR). Fricke dosimeter was employed to measure the absorbed dose at different PRR and to ensure uniform dose distribution of the electron beam. To study the dose rate effect, blood samples were irradiated to an absorbed dose of (4.7±0.2) Gy at different rates and cytogenetic damage was quantifi ed using the micronucleus assay. The obtained MN frequency showed no dose rate dependence within the studied dose rate range. Our earlier dose effect study using 8 MeV electrons revealed that the response of MN was linear-quadratic. Therefore, in the event of an accident, dose estimation can be made using linear-quadratic
dose response parameters, without adding dose rate as a correction factor.
Ključne riječi
dosimetry; microtron; 8 MeV electrons; pulse repetition rate
Hrčak ID:
49022
URI
Datum izdavanja:
17.3.2010.
Posjeta: 2.450 *