An x-ray film badge is a personal radiation dosimeter worn by workers to measure their cumulative dose of ionizing radiation over a set period, providing a record for regulatory compliance.
An x-ray film badge is a small personal dosimeter worn on the body to measure how much ionizing radiation a worker receives over a set period, often a month or a quarter. The original design held a piece of photographic film behind filters of different materials. Radiation darkened the film, and a laboratory read the film to estimate the dose. Today, most "film badges" use newer detectors, such as optically stimulated luminescence (OSL) or thermoluminescent (TLD) elements, but the name has stuck for any badge-style dosimeter.
Dosimeters matter because ionizing radiation can't be seen or felt, and its effects can build up over time. A badge gives each worker a personal, documented dose history. That record shows whether exposures are staying within legal limits and whether controls are working, and it supports the ALARA principle of keeping doses as low as reasonably achievable.
Badges are used in medical and dental imaging, nuclear power, industrial radiography and non-destructive testing, research labs, and by workers who use portable gauges or x-ray analyzers in the field.
At the end of each wear period, badges are returned to an accredited processor, which reports the dose for each wearer. Results are typically reported as deep dose (whole body), lens of the eye dose and shallow dose (skin). The employer reviews the results, investigates unusual readings and keeps the records.
A badge provides a dose record after the fact. Direct-reading devices, such as electronic personal dosimeters, show dose in real time and can alarm. Many programs use both: the badge as the legal dose record and a direct-reading device for immediate awareness during higher-risk work.
For employers that hold Nuclear Regulatory Commission (NRC) licenses, 10 CFR Part 20 sets the rules:
OSHA's ionizing radiation standard, 29 CFR 1910.1096, covers radiation sources not regulated by the NRC or an Agreement State. Under 1910.1096(d), employers must supply personnel monitoring equipment such as film badges to workers likely to receive more than 25 percent of the quarterly limits in the standard, to workers under 18 likely to exceed 5 percent, and to anyone entering a high radiation area. Employers must keep exposure records and tell each worker their exposure at least once a year. Employers that follow NRC or Agreement State rules for licensed material are deemed to comply with this section for that material. Many states also regulate x-ray machines through their own radiation control programs.
An inspection company performs industrial radiography on pipeline welds. Each radiographer wears a whole-body dosimeter badge on the chest and a ring dosimeter, along with an alarming electronic dosimeter during exposures. Badges are exchanged monthly and sent to an accredited processor, and the company's radiation safety officer reviews every report.
One month, a radiographer's badge shows a dose noticeably higher than his usual readings. The radiation safety officer interviews him and learns that a collimator was missing during several shots at a tight job site. The equipment is replaced, the crew reviews setup procedures and survey meter use, and the officer confirms the worker's annual total remains well within limits. Later readings return to normal.
Under NRC rules, adults likely to receive more than 10 percent of the annual limits, certain minors and declared pregnant workers, and anyone entering a high or very high radiation area must be monitored. OSHA's 1910.1096 sets similar triggers for sources it covers.
For NRC-licensed activities, 10 CFR 20.1201 sets an adult limit of 5 rem (0.05 Sv) total effective dose equivalent per year, plus separate limits for the eye lens, skin and extremities.
No. A badge only measures dose. Protection comes from time, distance, shielding and safe procedures.
True film-based badges have largely given way to OSL and TLD dosimeters, but many people still call any badge dosimeter a film badge. For more on the hazard itself, see x-ray exposure.
Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.
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