Building lab-scale x-ray tube based irradiators. (April 2016)

• Record Type: Journal Article
• Authors: Haff, Ron; Jackson, Eric; Gomez, Joseph; Light, Doug; Follett, Peter; Simmons, Greg; Higbee, Brad
• Is Part Of: Radiation physics and chemistry. Volume 121(2016:Apr.)
• Page Start: 43
• Page End: 49
• Publication Date: 2016-04
• Subjects: X-ray -- Irradiator -- Dose rate -- Dose uniformity; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2015.12.010
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Here we report the use of x-ray tube based irradiators as alternatives to gamma sources for laboratory scale irradiation. Irradiators were designed with sample placement in closest possible proximity to the source, allowing high dose rates for small samples. Designs using 1000 W x-ray tubes in single tube, double tube, and four tube configurations are described, as well as various cabinet construction techniques. Relatively high dose rates were achieved for small samples, demonstrating feasibility for laboratory based irradiators for research purposes. Dose rates of 9.76, 5.45, and 1.7 Gy/min/tube were measured at the center of a 12.7 cm container of instant rice at 100 keV, 70 keV, and 40 keV, respectively. Dose uniformity varies dramatically as the distance from source to container. For 2.54 cm diameter sample containers containing adult Navel Orangeworm, dose rates of 50–60 Gy/min were measured in the four tube system. Highlights: X-ray is demonstrated as an alternative to gamma for lab-based irradiation. Cabinets using one, two, and four 1000 W tubes are reported. Dose rate of 9.8 Gy/min/tube at the center of a 12.7 cm container of instant rice. Dose uniformity varies dramatically as the distance from source to container.