The internal and external dose of ionizing radiation received by workers in the course of employment.
A limb of a person or animal, or the part of a limb that is farthest from the body, especially somebody's hand or foot.
The external exposure of the lens of the eye and is taken as the dose equivalent at a tissue depth of 0.3 centimeter (300 mg <2>).
The NRC requires that its licensees limit maximum radiation exposure to individual members of the public to 100 mrem (1mSv) per year, and limit occupational radiation exposure to adults working with radioactive material to 5,000 mrem (50 mSv) per year.
The millirem (mrem) is one thousandth of a rem. A rem is a large dose of radiation, so millirem (mrem) is often used for the dosages commonly experienced, such as the amount of radiation received from medical x-rays and background sources.
Rad is a unit of measurement for the amount of a radiation absorbed in matter.
Rem is a unit used to measure the amount of radiation that results in the same amount of human tissue damage caused by one roentgen of radiation.
The absorbed dose describes the amount of energy that is absorbed by a unit of mass that is irradiated with some type of radiation of some magnitude.
Equal absorbed doses of different types of ionizing radiation cause different amounts of damage to living tissue. Therefore, the equivalent dose was defined to give an approximate measure of the biological effect of radiation.
A measure of the cancer risk to a whole organism due to ionizing radiation delivered non-uniformly to part(s) of its body.
Returned badges are read and reports are mailed and available online within 10 business days of receipt of the badges.
If you are using RDC's online account management program, an email will be sent to you when your reports are available for viewing, downloading, and printing.
If you are not using our online account management program, your dose reports will be mailed to you.
The annual dose limits for radiation workers are as follows:
TEDE < 5000 mrem
TEDE or Total Effective Dose Equivalent is the sum of internal and external whole body doses
RDC assigns PINs (Personal Identification Numbers) to identify wearers within an account. These PINs are unique to each individual. Dose information is reported and accumulated within the account based on these PINs. The PIN will still be listed on the report for each wearer. It also appears on every badge and ring we issue to the customer.
Lifetime dose may be added for a wearer when requested by the customer. It is the customer’s responsibility to provide the lifetime dose to RDC. That has always been the case. If there is any question on our end about a wearer’s identity, we will contact the customer for resolution prior to making any changes or reporting any dose.
It is normal to receive dose on the control dosimeter. It represents the background and transit dose received on the badge from the time it left our facility and until it was returned. The dose recorded on a control dosimeter is usually low, and relatively constant from report to report. A control dosimeter will usually record a small dose (5 - 20 mrem per month).
Our badges do read below 10 mrem. We do not report dose below 10 mrem due to the potential of false results at these very low levels of exposure and the 10mrem threshold is the level required to be reported by the regulations governing this industry.
Badges are read by heating internal phosphors until the absorbed energy from ionizing radiation is released in the form of light. The light that is emitted is then converted into dose by a computer algorithm. An image of the light output is stored in our database as a glow curve. If any contaminant, such as oil or debris, has reached the phosphor, it will emit light, giving the glow curve an image that is not typical of ionizing radiation. When this happens, the reading is flagged on the Dose Report. While it is apparent that a badge has been exposed to a contaminant, it is impossible to determine how much of the light output is from the contamination, and how much is from ionizing radiation. The dose is reported based on the total emitted light, but is flagged on the Dose Report as an "estimate" due to the abnormal glow curve. This affords the customer the opportunity to evaluate a wearer’s history and provide an estimated dose if applicable.
Yes, any report containing results that are outside of acceptable limits will be reviewed and the customer will be notified immediately so that appropriate actions can be taken.
If the dose is affected at all, the dose will be lower because heat is used to detect/extract the energy from the badge.
With DoseCheck, an individual can log in using their Badge Number and PIN, and see their year-to-date and previous year’s dose. This feature is free of charge to our customers. This view is not an accredited format and does not qualify for audit purposes: it does, however, enable the user to continuously monitor their exposure whenever they want.
To log on to DoseCheck, click here.
Reports, paper or electronic, should be kept for as long as your company is in business.
Yes! Please contact our Customer Care Department and we will gladly set you up to receive electronic copies of your reports through our online account management system.
Environmental Reports are designated for RDC’s type 82E and 83E environmental dosimeters. These reports are printed at the end of the regular reports and have the letter "E" at the end of the report number. There is currently no accreditation available for environmental dosimeters and our current NVLAP accreditation requires all non-accredited dosimeters to be reported on a separate page.
RDC’s customers are best served when we understand the sources around which you work. A completed Radiation Source Sheet helps us determine the accurate response of our dosimeters. An improperly exposed badge can be more easily identified and errors can corrected by making minor adjustments that ensure the most accurate dose readings possible.
Radiation Source Sheets are also used to calculate dose from our ring dosimeters. A ring dosimeter contains one phosphor, unlike our typical TLD badge, which contains four separate phosphors and filtration that can discriminate different energies. This makes it impossible to automatically determine what type of radiation a ring has been exposed and this discrimination of energies is what determines the type of radiation to which the badge has been exposed.
During the setup of your account, a review of your sources allows us to set the type of radiation the ring will be exposed to. This insures the proper correction values are applied during the calculation process. While we can report dose from our ring dosimeters without the proper correction factors, the readings may not be as accurate.