This recommendation applies to linear scale instruments used in general, regional and local prospecting and for subsurface and deep survey, excluding radiometric bore hole logging probes.
These instruments usually comprise the following:
— a detecting device with one or more Geiger-Miiller counter tubes;
— a counting r?te meter;
— a power supply;
— a listening device.
A radioactive source for checking is usual.
SIS SS IEC 421:1983 history
1983SIS SS IEC 421:1983 Nuclear instrumentation - Portable prospecting radiation meters with Geiger-Muller counter tube (linear scale instruments)