Highly Radiation Resistant Room Temperature Organic Perovskite Halide (Fapbi(3)) Crystal For Direct Detection Of Gamma-Ray Photons Down To Nano Curie Activity

We report a simple room temperature gamma (gamma)-ray detector with electrical read out made using as-grown highly textured crystals of organic perovskite halide formamidium lead iodide (FAPI) prepared by solution method. The detector uses electronics that measure resistance changes, similar to those used in optical detectors. Although it does not have energy resolution, the detector can be used as a quick tool to detect the presence of gamma-ray in wide energy range, from the 100 to the 1250 keV range, with noise limited sensitivity capable of detecting activity down to 50 nCi. The FAPI detector has a reasonable mu tau approximate to 5.2 x 10(-3)cm(2)V(-1) gamma-ray making it useful in applications needing such long exposure. Also, a proof of concept has been established toward wearable, low cost, portable solid state gamma ray detectors using paper electronics based halide perovskites.