Table 6.

Estimates of weighted average absorbed dose per examination (mGy) to thyroid, from 17 nuclear medicine procedures.

	1960–1969	1970 – 1979	1980 – 1989	1990 – 1999	2000–2009
Thyroid scan	630	290	230	150	130
Thyroid uptake	64	58	50	48	56
Brain scana	1.8	1.3	3.6	9.0	6.9
Brain blood flowb	10/7.6	8.5/2.0	4.1/1.1	5.0/4.8	2.9
Lung perfusion	0.48	0.35	0.44	0.46	0.46
Lung ventilation	0.05	0.05	0.05	0.05	0.04
Bone scan	2.1	1.1	0.96	1.1	1.2
Liver scan	0.23	0.15	0.15	0.15	0.14
Hepatobiliary scan	0.01	0.01	0.03	0.03	0.03
Bone marrow scan	1.9	0.60	0.51	0.51	0.52
Pancreas scan	21	17	6.7	4.2	4.2
Renal Scan	0.14	0.17	0.31	0.17	0.07
Cardiac procedures	0.72	11	17	12	9.2
GI bleeding and Meckel’s scan	4.2	4.2	4.2	4.6	5.4
Tumor localization	78	35	6.9	8.4	7.6
Blood Volume	0.02	0.06	0.09	0.08	0.05
Iron Metabolism	0.31	0.31	0.31	0.31c	-

^aWith administration of blocking agent for Tc-99m pertechnetate

^bWithout/with administration of blocking agent for Tc-99m pertechnetate

^cProcedure not performed in latter half of decade