Saturday, May 7, 2011

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

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