A comparison of the microbicidal effectiveness of gamma rays and high and low energy electron radiations

Attenuation of 10MeV electron beam energy to achieve low doses does not affect Salmonella spp. inactivation kinetics

“…There was no statistically significant difference between the D 10 values of either Salmonella 4,[5],12:i:-or the Salmonella cocktail (S. 4,[5],12: i:-, S. Heidelberg, S. Newport, S. Typhimurium, S. Enteriditis) when irradiated with either the non-attenuated 10 MeV eBeam or the attenuated 10 MeV eBeam (Table 1). These results are in agreement with Tallentire et al (2010), who compared the inactivation kinetics of Bacillus pumilus under three different eBeam irradiations (10 MeV, 100 and 80 keV) and found no difference in the survival response.…”

Microbicidal effectiveness of X-rays used for sterilization purposes

“…The microbiological test piece comprised test filters equal to those employed previously (Tallentire et al, 2010), prepared and handled in an identical manner. A new batch of test filters was made for the X-ray experiments using a water suspension of spores of B. pumilus ATCC 27142 containing $2 Â 10 7 viable spores/cm 3 obtained from NAMSA.…”

“…As pointed out earlier (Tallentire et al, 2010), legitimate comparisons of the microbicidal effectiveness of different types of radiation can only be made if standardised conditions are applied to the management of test filters before, during and after irradiation. Accordingly, the 'set-up' and recovery conditions described for gamma irradiation in our previous paper were precisely followed for the present X-ray experiments, the experimental arrangement being that each test filter was located in a 10 cm Petri dish on top of a hydrated filter pad to provide 'standard' conditions of fully hydrated spores in equilibrium with air during irradiation.…”

“…In a previous paper, we have shown that radiation dose provided by cobalt 60 gamma rays, high energy electrons or low energy electrons has equal microbicidal effectiveness (Tallentire et al, 2010). A specially designed microbiological test piece that allowed exposure to each radiation type using the same defined set of conditions and with each dose measurement, irrespective of radiation type, being traceable to a national measurement standard, was used to achieve this demonstration.…”

Quantifying the Reduction in Potential Health Risks by Determining the Sensitivity of Poliovirus Type 1 Chat Strain and Rotavirus SA-11 to Electron Beam Irradiation of Iceberg Lettuce and Spinach

“…For example, gamma ray (cobalt-60)-based ionizing radiation uses photons in the energy range of about 1.6 MeV, whereas E-beam uses electrons at energies of about 10 MeV (27). Similarly, the dose rate of gamma rays from cobalt-60 is very often in the range of hundreds of grays per minute (40), while that of E-beam is around tens of millions of grays per minute (27). Thus, E-beam processing is a significantly higher-throughput process than gamma irradiation processes, and the technology has the potential to be deployed around the world since there are no associated issues, such as shipping, storing, and disposing of radioactive material.…”