TABLE 1

Typical Administered Activities for Different Types of Scans

Scan	Isotope	Typical activity (MBq)	μSv/h*	n
GHPS	^99mTc	900	1.9 ± 1.3	9
MIBI
Stress cardiac scan	^99mTc	1,000	1.8 ± 1.4	8
Rest cardiac scan	^99mTc	300	0.9 ± 0.6	4
¹³¹I scan after therapy	¹³¹I	20 μSv/h at 1 m → ∼350	0.8 ± 1.4	10
Ventilation/perfusion lung scan	^99mTc	500 + 220	0.8 ± 0.7	28
Bone scan	^99mTc	900	0.8 ± 0.6	34
Labeled white blood cells	^99mTc	800	0.7 ± 0.7	6
⁶⁷Ga tumor scan	⁶⁷Ga	370	0.7 ± 0.3	8
Thyroid scan	^99mTc	150	0.4 ± 0.3	4
Renal scan	^99mTc	180	0.4 ± 0.4	26
Stress cardiac scan	²⁰¹Tl	100	0.4 ± 0.5	6
Rest cardiac scan	²⁰¹Tl	40	0.2 ± 0.1	6
Brain SPECT	^99mTc	900	—	2