TO:UW-Madison and UW Hospital Radiation Workers in Research & Clinical Settings

April 17, 2017

TO:UW-Madison and UW Hospital Radiation Workers in Research & Clinical Settings

FROM:Office of Radiation Safety (ORS)

REF:Annual Form 5 Explanation

To help you understand your annual dose report, please see the information below.

The UW’s allowable annual dose limits are set at ten percent, thirty percent, and ninety percent of the annual regulatory dose limit. The set limit is based on the activity you are working with, the type of work you are doing, and your workload.

ORS is constantly reviewing your dose records. If you exceed the dose limits for your wear period in your group, we will contact you immediately.

Exposure Type / Annual Regulatory Dose Limit (rem)
Whole Body Deep (DDE) / 5
Lens of Eye (LDE) / 15
Whole Body Shallow (SDE) / 50
Extremity / 50

Per NRC 10 CFR 19, and DHS 157 Wisconsin Radiation Protection, individuals receiving two percent (0.1rem) or more of the annual dose will receive a copy of the annual dose report. You will not receive this report if you do not exceed the 0.1 rem limit.

Landauer is our vendor for dosimetry. We use their occupational dose record (Equivalent Form 5-Annual) for providing the annual dose report.

For your easy understanding, below is the explanation of the terms used in the Landauerreport.

Definitions

11A.Effective dose equivalent (EDEX) is the sum of the products of the dose equivalent to the organ or tissue and the weighting factors applicable to each of the body organs or tissues that are irradiated.

11B.Deep-dose equivalent (DDE) external whole-body exposure at a tissue depth of 1 cm (1000 mg/cm2) (whole body badge)

12.Lens (Eye) dose equivalent (LDE) external exposure of the lens of the eye at a tissue depth of 0.3 centimeter (300 mg/cm2) (whole body badge).

13.Shallow-dose equivalent, Whole Body (SDE) external exposure of the skin of the whole body at a tissue depth of 0.007 centimeter & mg/cm2).

14.Shallow dose equivalent, Max Extremity (SDE) external exposure of the skin of an extremity at a tissue depth of 0.007 & mg/cm2).

15.Committed effective dose equivalent(CEDE) is the sum of the products of the weighting factors applicable to each of the body organs or tissues that are irradiated and the committed dose equivalent to these organs or tissues. (Internal uptake- Bioassay)

16.Committed dose equivalent(CDE) the dose equivalent to organs or tissues that will be received from an intake of radioactive material by an individual during the 50-year period following the intake.(Internal uptake-Bioassay)

17.Total Effective Dose Equivalent (TEDE) means the sum of the effective dose equivalent (for external exposures) and the committed effective dose equivalent (for internal exposures). Sum( EDEX + CEDE)

18.Total Organ Dose Equivalent, Maximum Organ (TODE) the sum of the deep dose equivalent and the committed dose equivalent to the organ receiving the highest dose. Sum (DDE + CDE)

REM(Roentgen equivalent man)Unit used to measure the dose equivalent (or effective dose), which combines the amount of energy (from any type of ionizing radiation that is deposited in human tissue), along with the medical effects of the given type of radiation.

Bioassay (radiobioassay) means the determination of kinds, quantities or concentrations, and, in some cases, the locations of radioactive material in the human body, whether by direct measurement (in vivo counting) or by analysis and evaluation of materials excreted or removed from the human body.

No Dose (ND)

If you have any questions regarding the report you received, please email us at

Thank you.

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