Extended Data Fig. 3: Comparison of optical fibre designs with various geometric dimensions.
From: A swallowable X-ray dosimeter for the real-time monitoring of radiotherapy
a, Light intensity distribution of the end of an optical fibre made of thermoplastic silicone with a radius of 2 mm and a length of 8 mm, in which a cylindrical ring made of a luminescent material with a thickness of 300 μm is embedded. b and c, Simulations of an optical fibre containing a cylindrical luminescent core with a diameter of 1 mm and irradiated with X-rays from the left (b) and right (c) sides, respectively. d–f, Power distribution at the fibre’s end with different diameters but the same luminous core. g and h, The ratio of the intensity detected by a detector (with an area of 1 mm2 in the centre of the fibre) and the diameter of the fibre when the luminescent core transmittance is 10% (g) and 3% (h), respectively.
