... and keep driving until you come to...
Yes, I'm an oldie too.
Anyway, according to one of the Apollo Radiation Protection documents (NASA-CR-106949):
The spacecraft radiation detectors consist of the Nuclear Particle Detection System, the Van Allen Belt Dosimeter, three Personal Radiation Dosimeters, and a portable Radiation Survey Meter. Each astronaut also carries four (4) passive packages which can be read out after return to earth.
The NPDS and VABD data are telemetered to the ground and are available almost continually. PRD and RSM data are available when read out by the astronauts, normally twice a day.
I found a picture of the VAB Dosimeter:
But I have been unable to find any information on exactly where it was located in the spacecraft.