Visualizing the dose distribution and linear energy transfer by ID and 2D ESR imaging: A potassium dithionate dosimeter irradiated with C6+ and N7+ ions
2008 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, Vol. 112, no 29, 8437-8442 p.Article in journal (Refereed) Published
We report the application of one- and two-dimensional (1D and 2D) spectral-spatial electron spin resonance imaging (ESRI) for visualizing the dose distribution and linear energy transfer (LET) in a potassium dithionate, K 2S2O6 (PDT), dosimeter irradiated with the heavy ions C6+ and N7+. The ESR spectrum in the irradiated PDT consists of a superposition of two isotropic signals assigned to two ·SO3- radicals, R1 and R2, with no hyperfine splittings and slightly different g values. The ID ESRI profiles clearly indicate the spatial penetration of the beams and the location of the sharp maximum dose, the "Bragg peak", detected for each beam. The depth penetrations are different: ≈2.3 mm for C6+ and ≈1.8 mm for N7+ beams, ±0.1 mm, beyond these limits, no radicals were detected. 2D spectral-spatial ESRI images reflect both the dose distribution and the spatial dependence of the relative intensities of radicals R1 and R2, an effect that is assigned to the depth variation of the LET. This study has demonstrated that ESRI is a promising new method for dose and LET determination. Of particular interest are applications in the field of radiotherapy with heavy ions, because in this case the Bragg peak is pronounced and the dose can be focused at specific depths while the surrounding areas are protected. © 2008 American Chemical Society.
Place, publisher, year, edition, pages
2008. Vol. 112, no 29, 8437-8442 p.
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-44550DOI: 10.1021/jp803695pLocal ID: 77001OAI: oai:DiVA.org:liu-44550DiVA: diva2:265412