Gamma exposure at Borehole 1007

Gamma exposure at Borehole 1007

Here we are right next to the destroyed well bore with the energy-compensated HP-270 Geiger probe, beta window closed so as to measure a pure gamma exposure rate. Our meter is showing 370 CPM, and the tube’s response is 1200 CPM / mR / hr. So our exposure rate here is 0.3 milliroentgen / hour.