Why are there no electrical generators utilising the electron/s of beta decay from a radioisotope for generating a working current?
For example, how much radioisotope would I need to generate 1A or higher, i.e. 1C/s = 6E18 electrons/s? Are there species that can sustain this rate of beta decay for any practical length of time, e.g. 25-40 years, say?
I envision a set up of the radioisotope firing the beta particle at a metal anode. Since this hasn't been done in practice - Why? Can beta decay be regulated (e.g. increased) by an external field or change in ambient conditions?.