TABLE 1

External Dose Rates per Procedure Measured at Various Distances from Patient

	Distance from patient
Type of examination	0.25 m	0.5 m	1 m	2 m
Whole-body bone scan (^99mTc-MDP)	1.31 ± 0.71	0.56 ± 0.20	0.33 ± 0.12	0.13 ± 0.03
Thyroid scan (^99mTc-pertechnetate)	1.70 ± 0.73	0.86 ± 0.23	0.43 ± 0.09	0.20 ± 0.02
Renal scan (^99mTc-DMSA)	1.06 ± 1.13	0.48 ± 0.36	0.24 ± 0.16	0.08 ± 0.02
Myocardial perfusion scan
^99mTc-MIBI, stress	1.65 ± 1.04	0.69 ± 0.26	0.27 ± 0.13	0.09 ± 0.03
^99mTc-MIBI, rest	2.29 ± 1.35	1.42 ± 0.59	0.43 ± 0.18	0.19 ± 0.06
²⁰¹Tl-chloride, stress	0.32 ± 0.16	0.13 ± 0.03	0.07 ± 0.05	0.03 ± 0.01
²⁰¹Tl-chloride, redistribution	0.34 ± 0.16	0.18 ± 0.06	0.13 ± 0.08	0.05 ± 0.01