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IDIDAS : References: Assessment of differences between X and γ rays in order to validate a new generation of irradiators for insect sterilization


Assessment of differences between X and γ rays in order to validate a new generation of irradiators for insect sterilization




2009 International Nuclear Atlantic Conference - INAC 2009 Rio de Janeiro,RJ, Brazil, September27 to October 2, 2009 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR - ABEN ISBN: 978-85-99141-03-8


Recent fears of terrorism provoked an increase in delays and denials of transboundary shipments of radioisotopes. This represents a serious constraint to sterile insect technique (SIT) programs around the world as they rely on the use of ionizing energy from radioisotopes for insect sterilization. In order to validate a novel X-ray irradiator, a series of studies on Ceratitis capitata (Wiedemann) and Anastrepha fraterculus (Wiedemann) (Diptera: Tephritidae) were carried out, comparing the relative biological effectiveness (RBE) between X-rays and traditional γ radiation from 60Co. Male C. capitata pupae and pupae of both sexes of A. fraterculus, both 24 to 48 h before adult emergence, were irradiated with doses ranging from 15 to 120 Gy and 10 to 70 Gy respectively. Estimated mean doses of 91.2 Gy of X and 124.9 Gy of γ radiation induced 99% sterility in C. capitata males. Irradiated A. fraterculus were 99% sterile at about 40-60 Gy for both radiation treatments. Standard quality control parameters were not significantly affected by the two types of radiation. There were no significant differences between X and γ radiation regarding mating indices. The RBE did not differ significantly between the tested X and γ radiation, and X-rays are as biologically effective for SIT purposes as γ rays are. This work confirms the suitability of this new generation of X-ray irradiators for pest control programs in UN Member States.


Mastrangelo, Thiago; Walder, Julio M.M.; Parker, Andrew G.; Jessup, Andrew; Pereira Rui; Orozco-Davila, Dina; Islam, Amirul; Dammalage, Thilakasiri; Walder, Julio M.M.




Mastrangelo T et al-2009-Assessement difference X ray and gamma ray.pdf    
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Created at 14/06/2014 01:14 by Abdeljelil Bakri
Last modified at 14/06/2014 01:14 by Abdeljelil Bakri