Download Electronic irradiation of foods: an introduction to the by R. B. Miller PDF

By R. B. Miller

This booklet is dedicated to an exam of the applied sciences and functional implementation recommendations linked to nutrition irradiation utilizing accelerator assets of ionizing radiation, particularly electron beams and x-rays. Introductory chapters summarize the consequences of ionizing radiation on organic organisms and the natural compounds comprising meals, and offers an outline of the meals irradiation approach. next chapters conceal the main points of the electron beam and x-ray strength deposition, electron accelerator applied sciences, beam scanning platforms, fabric dealing with platforms, defensive layout, and strategy keep watch over issues. vital appendices disguise radiation dosimetry, prompted radioactivity, and ozone new release.

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Extra resources for Electronic irradiation of foods: an introduction to the technology

Sample text

1-D x-ray energy utilization efficiency, and max:min ratio for the double-sided irradiation configuration of Figure 2-14. 12) Eqs. 0. 54 at xopt . 3. Dose and Dose Rate Estimation The dose and dose rate delivered to the product are determined by the operating parameters of the three key components of the processing system (accelerator, scanner and conveyor). In the next few paragraphs we illustrate how these quantities can be estimated for both electron beam and x-ray irradiation systems. a. Electron Beams Consider the schematic diagram of Figure 2-16.

8). 45. The throughput efficiency for x-rays must take into account these same factors, plus the low x-ray conversion efficiency. 5 kGy XR: 1 kGy 1000 XR: 3 kGy XR: 10 kGy 100 1 10 100 1000 Electron Beam Power (kW) Figure 2-17. Estimated throughput rates for electron beam and 5 MeV x-ray systems as a function of the electron beam power produced by the accelerator. 5 MeV, the throughput rates will increase by approximately 50%) Using these throughput efficiency estimates, the throughput rates (in pounds per hour) that might be anticipated for both electron beam and x-ray systems are graphed in Figure 2-17 versus electron beam power for several different values of the minimum required dose.

Magnetrons used to power linac systems are generally compact, efficient, and operate at voltages of no more than a few tens of kilovolts. Because the processes of emission, rf interaction, and spent beam collection occur in the same physical region, however, they are generally limited in their average power output by thermal considerations. A magnetron is an oscillator, and therefore does not require a 20 Electronic Irradiation of Foods scan horn direction of scan direction of conveyor scan magnet Figure 2-3.

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