Wop a VE wag | Table 1, Relaxation Depth l/ cm Average Activity In the top Z cn z, on 5 10 ” ! . oo Fggverston factors relating the net photopeak count rate (cps) for 7Cs to source activity in the soil and to external exposure rate as a functon of source distribution. Total Activity por Unit Area sis’ A ii, No pcig CHS 0 13 5 8.2 10 5.6 15 4.1 25 2.6 49 1.6 60 Ll 0 id Expanded Exposure Rate at the 1 Meter Level Rin per cps Ciné Cys 1.09 3.6 1.5 3.7 2.9 3.4 15 10 6.3 15 5.2 25 3.7 ag 2.5 60 I.? Q 38.8 5 7.5 10 6.4 15 5.6 25 4.3 69 2.2 40 5011134 7.9 3.1 45