Table 2.

Mean and standard deviation of photon counts recorded using the SUERC portable OSL reader at 470 nm, the IRSL instrument at 890 nm and the pulsed PSL instrument, from sets of ten individual sachets of salt exposed to gamma doses from 0–500 μGy.

	Portable OSL 470 nm		Portable IRSL 890 nm		Pulsed PSL 880 nm
Dose (μGy)	Counts	CV (%)	Counts	CV (%)	Counts	CV (%)
0	3,534 ± 453	12.8	1,204 ± 313	26.0	1,324 ± 102	7.7
20	3,307 ± 689	20.8	1,443 ± 300	20.8	1,256 ± 150	12.0
50	5,091 ± 460	9.0	1,843 ± 607	32.9	1,487 ± 122	8.2
100	7,323 ± 444	6.1	2,214 ± 202	9.1	1,701 ± 143	8.4
200	11,860 ± 1,086	9.2	2,388 ± 655	27.5	2,038 ± 237	11.7
500	25,202 ± 2,303	9.1	4,565 ± 687	15.1	3,649 ± 385	10.6