Advances in Materials Science and Engineering Assessment of Gamma Radiation Hazards Related to Geologic Materials: Comparison of Results by Field Gamma Spectrometry and Laboratory Methods

Table 2

Statistic measures of the activity concentration index () sets from different procedures for estimation of isotopes specific activity and related values.

	Minimum	Maximum	Mean	G.M.	H.M.	Med.	S.D.	S.E.	L.Q.	U.Q.	I.Q.R.
(field)	0.29	2.83	1.38	1.22	1.04	1.23	0.65	0.13	0.91	1.65	0.74
(ICP/XRF)	0.18	2.49	0.94	0.80	0.65	0.88	0.52	0.11	0.56	1.07	0.52
(LGS)	0.13	2.12	0.80	0.69	0.52	0.77	0.48	0.10	0.44	0.89	0.45

G.M.: geometric mean; H.M.: harmonic mean; Med.: median; S.D.: standard deviation; S.E.: standard error of the mean; L.Q.: lower quartile; U.Q.: upper quartile; I.Q.R.: interquartile range.