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 consists of a monostable multivibrator using the LM3900 transconductance operational...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...