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Radiation Protection Dosimetry 66:69-74 (1996)
© 1996 Oxford University Press

Low Energy X Ray Dosimetry Studies (7 to 17.5 keV) with Synchrotron Radiation

N.E. Ipe, H. Bellamy, J.R. Flood, K.R. Kase, K.J. Velbeck and R.A. Tawil

Unique properties of synchrotron radiation (SR), such as its high intensity, brightness, polarisation, and broad spectral distribution (extending from X ray to infrared wavelengths) make it an attractive light source for numerous experiments. As SR facilities are rapidly being built all over the world, they introduce the need for low energy X ray dosemeters because of the potential radiation exposure to experimenters. However, they also provide a unique opportunity for low energy X ray dosimetry studies because of the availability of monochromatic X ray beams. Results of such studies performed at the Stanford Synchrotron Radiation Laboratory are described. Lithium fluoride TLDs (TLD-100) of varying thicknesses (0.015 to 0.08 cm) were exposed free-in-air to monochromatic X rays (7 to 17.5 keV). These exposures were monitored with ionisation chambers. The response (nC.Gy-1) was found to increase with increasing TLD thickness and with increasing beam energy. A steeper increase in response with increasing energy was observed with the thicker TLDs. The responses at 7 and 17.5 keV were within a factor of 2.3 and 5.2 for the 0.015 and 0.08 cm thick TLDs, respectively. The effects of narrow (beam size smaller than the dosemeter) and broad (beam size larger than the dosemeter) beams on the response of the TLDs are also reported.


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A. Konnai, N. Nariyama, S. Ohnishi, and N. Odano
Energy response of LiF and Mg2SiO4 TLDs to 10-150 keV monoenergetic photons
Radiat Prot Dosimetry, December 20, 2005; 115(1-4): 334 - 336.
[Abstract] [Full Text] [PDF]


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