Doses to Remember

• Radiation workers' annual whole-body radiation dose limit: 5 rem
• Fetus' total whole-body radiation dose limit: 0.5 rem
• General public's annual whole-body radiation dose limit: 0.1 rem
  
  
• Patients treated with ¹³¹I must remain confined until the dose to a member of the public does not exceed 0.5 rem.
  
  
• Bone scan: Interrupt nursing for 3 hours
• Cardiac (Mibi): Interrupt nursing for 3 hours
• V/Q scan: Interrupt nursing for 12 hours
• Cardiac (²⁰¹Tl): Interrupt nursing for 2-4 days
• ¹³¹I > 0.4 µCi: Cease nursing
  
  
• Medical event: Administered activity > 20 % of prescribed dose AND [effective dose equivalent > 5 rem OR organ dose > 50 rem].
  
  
• Major spill if > 100 mCi: ^99mTc and ²⁰¹Tl
• Major spill if > 10 mCi: ⁶⁷Ga and ¹¹¹In
• Major spill if > 1 mCi: ¹³¹I
  
  
• Maximum Mo contamination: < 0.15 µ Ci ⁹⁹Mo per mCi ^99mTc
  
  
• Furosemide: 1 mg/kg, up to 40 mg
• Morphine: 0.04 mg/kg
• CCK: 0.02 µg/kg

NRC Package Labeling
Label	Surface Radiation (mrem/hr)		Radiation at 1 Meter (mrem/hr)	Example
White I	< 0.5		N/A	99mTc
Yellow II	< 50	AND	< 1	131I
Yellow III	> 50	OR	> 1	99Mo generators
Source: USNRC labeling