Dosimetry

Monitoring badges known as dosimeters will be issued to employees whom are likely to be exposed to 10% or greater of the annual dose limit for radiation . The various types of monitoring media are as follows:

Badge Type

Function

Chest (P1), Collar (P13), & Waist (Whole Body)

Provides a measurement of the deep (DDE) and shallow (SDE) radiation dose equivalent received by the whole body.

Ring (U3 or U4)

First ring (identified as a “U3”) provides a measurement of the extremity radiation dose equivalent received by the lower arm and hand. It is to be worn under the protective latex glove on a finger of the hand likely to receive the highest radiation exposure. A second ring (identified as a “U4”) is worn on a finger of the opposite hand which is recommended for individuals who routinely prepare and/or administer radiopharmaceuticals or brachytherapy.

Fetal

For declared pregnant workers, to be worn in an area closest to the fetus such as the waist. Monitored on a monthly basis.

Control

For monitoring radiation exposure received during transit. At the user’s facility, the badge is stored in a radiation free area during the current wear period.

Area Monitor

Provides measurement of radiation levels in and around work areas that contain radiation therapy equipment or sources.

 

 

 

Requesting Dosimeters

In order to obtain a dosimeter an online training is required. Click the link below to complete the required training in order to request a dosimeter:

Dosimeter Request Instructions

Once completed please notify your department representative.

Pregnant Employees

The Nuclear Regulatory Commission (NRC) regulations state that during the entire gestation period, the maximum permissible dose equivalent to the embryo-fetus from occupational exposure of the expectant mother shall not exceed 500 mrem (10% of the maximum permissible dose for non-pregnant employees).

For additional information please see the provided handout.

Prenatal Radiation Exposure Guidelines

In order to declare pregnancy please fill out the Declaration of Pregnancy form listed below. Once completed forms can be returned to [email protected] 

Declaration of Pregnancy Form

Previous Exposures

Employees who have been issued a dosimeter prior to their employment at UCLA Health will need to fill out the previous exposure monitoring form and return it to [email protected]

Previous Exposure Monitoring Form

Annual Occupational Dose Limits

Dose Type

Dose Limit

Total Effective Dose Equivalent (TEDE) (whole-body dose from both external and internal sources)

5 rem (5,000 mrem)/year

Lens Dose Equivalent (LDE)

(dose to the lens of the eye)

15 rem (15,000 mrem)/year

Skin Dose Equivalent (SDE)

(Skin and Extremity dose)

50 rem (50,000 mrem)/year

Deep Dose Equivalent (DDE)

(whole-body dose which includes: head, trunk, active blood forming organs & gonads)

5 rem (5,000 mrem)/year

Total Organ Dose Equivalent (TODE)

(The organ receiving the highest dose from both external and internal sources)

50 (50,000 mrem)/year

Declared Pregnant Woman

0.5 rem (500 mrem) for entire gestation