4 pCi/g (SOIL SAMPLE} COUNTS/SEC. (IMP) 3 2 \ \ 10 RELAXATION DEPTH = 1/a ‘\ \ \ \ ~ <p (@ 1S IN THE EXPONENT SHOWING THE RATE OF DECREASE WITH DEPTH} - obs 9 ee 7 “ \ 6 UNIFORM ~~ “TO ~ N may, “hs ~ ms Ts 3 ee ‘meen rn ~ SY ~| pny a= 1 ~~, PS “Boss aeer 2 0 2 4 6 8 10 12 SOIL SAMPLE DEPTH (CM) FIGURE B-8-10, IMP SENSITIVITY TO “4! am SOIL CONCENTRATIONS AS A FUNCTON OF SOIL SAMPLE DEPTH. B-8-17