1. A.C. Melissinos, Experiments in Modern Physics (Academic Press, New York, 1955)
2. An ionisation smoke alarmo from Ei Electronics. Credit Hiya111 at English Wikipedia,
https://en.wikipedia.org/wiki/Smoke_detector#/media/File:Smokealarm.JPG
. Accessed 20 Dec 2016, Public Domain
3. M.E. Rudd, R.D. DuBois, L.H. Toburen, C.A. Ratcliffe, T.V. Goffe, Phys. Rev. A 28, 3244 (1983)
4. T. Zhao, Y. Chen, S. Han, J. Hersch, Nuclear Instruments Methods Phys. Res. Sect. A 340(3), 485–490 (1994)
5. G.F. Knoll, Radiation Detection and Measurement (Wiley, New York, 2010)