. Author manuscript; available in PMC: 2019 Apr 11.

Published in final edited form as: J Radioanal Nucl Chem. 2018;318:10.1007/s10967-018-6032-9. doi: 10.1007/s10967-018-6032-9

Table 2.

Count ratios of ²²⁹Th RM—SRM 4328C as measured by LS and NaI(Tl) counters

LS measured count ratios				NaI(Tl) measured count ratios
LS counter	Scintillant	Grand mean massic count ratio	S_x	Scintillant	Grand mean massic count ratio	S_x
B	UGAB	5.5186	0.0121	UGAB	5.5148	0.0143
B	ECOS	5.5199	0.0155
H	UGAB	5.5216	0.0088	ECOS	5.5303	0.0166
H	ECOS	5.5301	0.0166
Great grand mean		5.5226	0.0109		5.5226	0.0170

Counters H and B are as described in the text. UGAB and ECOS are as previously defined. S_¯x is a relative precision estimator equivalent to the standard deviation of the mean