This circuit uses a diode as a radiation sensor. The operational ones are old because the publication is from the 80's, but modern low voltage equivalents can be tested.
This circuit with silicon transistors at the time was found in the Radio Electronics magazine of...
This circuit was found in Electronics Handbook, Vol XIII 1993 and consists of a simple direction...
The National Semiconductor LM675 operational amplifier can provide up to 3 A of output current. In the...