Basics of Dosimetry and Radiation Monitoring Badges


What is dosimetry?
– Dosimetry is the measurement of doses in matter and tissue from ionizing radiation or radioactivity


Why is radiation monitoring important?
– NRC and agreement states that mandate employers provide protection and monitoring to insure occupational doses are as low as reasonably achievable (ALARA).


Who is required to wear radiation badges?
– All employees who receive 500 mrem in one year must be badged.


Annual dose limits for radiation workers:
• TEDE < 5000 mrem
– Total Effective Dose Equivalent
– Sum of internal and external whole body doses
• Lens of eye < 15000 mrem
• Shallow dose equivalent (skin/extremity) < 50000 mrem
• Declared pregnant worker 500 mrem


Who are the beneficiaries of radiation monitoring?
Every employee monitored is a beneficiary as they work with peace of mind knowing their health is not at risk.
Every company owner is a beneficiary as documented occupational dose monitoring provides protection against current or future legal employee health claims (so long as the owner is able to show documented evidence that his/her employees did not exceed their occupational dose limits during their term of employment). This is why records should be kept for the lifetime of the business.
Providing workers with individual personal radiation dosimeter is about more than meeting regulations. It gives both worker and employer peace of mind. Knowing that the radiation exposure is constantly being monitored with a fully accredited dosimeter is a great anxiety reducer.


How do I wear the dosimetry badge?
The dosimeter badge comes with a plastic strap and a metal clip to attach to your clothing. the whole body dosimeter should be positioned between the collar and the waist. Best practice dictates that the badge be positioned at the point of highest dose, which means outside any protective gear and closest to the radiation source.
If you are wearing a lead apron and thyroid collar, you are eligible for a special calculation, such as Webster 1 or 2, which reduces your reported dose by taking your safety gear into account.
For Webster 1, wear your single badge on your collar outside any protective gear.
For Webster 2, wear you collar badge outside your protective gear and the waist badge under your apron.


What is the control badge?
The control badge is used to monitor non-occupational energies that the personnel badge was exposed to. This includes background and other sources of radiation not a part of the workplace radiation exposure. The control badge should be kept with the worker badge, except when worn, or in an area away from any radioactive source.
It travels to and from the facility with the personnel badges, allowing the net occupational exposure to be accurately determined.

Contact Med-Pro for more information.