This effect was evident in a ∼75 nm red-shift for samples swelled in ethanol after irradiation with a dose of 325 kGy (Fig. 2d–f). Fig. 3 shows the full range of sensitivity for P(OEGMA-BP) and P(MMA-BP)-based sensors which display an increasing blue or red-shift, respectively, in the wavelength of reflected light with increasing radiation dose.