Occupational Dose Records & NRC Form 5

Occupational radiation dose recordkeeping and reporting sound like paperwork — until an NRC or Agreement State inspector asks for three years of Form 5 records and the annual worker notifications, and the program cannot produce them. Recordkeeping and reporting failures are among the more avoidable radiation-safety citations.

Occupational dose records and reports are governed by 10 CFR Part 20 Subparts L (Records) and M (Reports): the licensee records monitored dose on NRC Form 5, retains individual monitoring records until license termination, reports doses that exceed limits to the NRC within defined timelines, and gives each monitored worker an annual written dose report.¹²³ Getting the record content, retention, and reporting timelines right is a core radiation safety officer (RSO) responsibility.

Introduction

Every radioactive-material and radiation-machine program that monitors workers generates occupational dose records. The regulatory question is not whether to keep them but exactly what to record, how long to retain it, and when a record becomes a report — to the NRC, to an Agreement State, or to the worker. These requirements are precise, and inspectors check them because they are easy to verify and hard to fix after the fact.¹⁴

This guide organizes the occupational dose recordkeeping and reporting framework: the Subpart L records and their retention periods, the Subpart M reports and their timelines, the dose quantities that make up NRC Form 5, the worker-notification duty under 10 CFR Part 19, and the NRC-endorsed instructions in Regulatory Guide 8.7. It closes with practical tips and the jurisdictional context for the states DRPS serves.³⁵

Topic Explanation

Records versus reports

Part 20 draws a clear line between two obligations:

• Records (Subpart L) are the documents a licensee must create and retain — the radiation protection program, surveys, individual monitoring results, and doses to members of the public.¹
• Reports (Subpart M) are the notifications a licensee must send — to the NRC or Agreement State — when specified events occur, such as a dose exceeding a limit, a lost source, or an annual individual-monitoring submission.²

A single event can trigger both: an overexposure creates a record and requires a report. The RSO's job is to know which is which and to meet each requirement.

NRC Form 5 and NRC Form 4

Two NRC forms anchor occupational dose recordkeeping, and Regulatory Guide 8.7, Revision 4, provides the NRC-endorsed instructions for completing them.⁵

• NRC Form 5, "Occupational Dose Record for a Monitoring Period," records an individual's dose for a monitoring period. Under 10 CFR 20.2106, the licensee records the results of individual monitoring on Form 5 or on a record containing all the information required by Form 5, with entries made at least annually.⁶
• NRC Form 4, "Cumulative Occupational Dose History," compiles a worker's lifetime cumulative occupational dose, used when the licensee must determine a worker's prior dose (for example, to apply the planned-special-exposure or lifetime-dose provisions).⁵

The dose quantities on the record

An occupational dose record is not a single number. It captures the external and internal components and their sums, using the defined dose-equivalent quantities in 10 CFR 20.1003 and 20.1201:⁷

• DDE — deep-dose equivalent (external whole-body dose at 1 cm depth).
• LDE — lens dose equivalent (external dose to the lens of the eye).
• SDE — shallow-dose equivalent, recorded for the whole body (SDE-WB) and the maximally exposed extremity (SDE-ME), at 0.007 cm depth.
• CDE and CEDE — committed dose equivalent to an organ and committed effective dose equivalent, from internal intakes.
• TEDE — total effective dose equivalent, the sum of the external DDE and the internal CEDE.
• TODE — total organ dose equivalent, the sum of the DDE and the CDE to an organ.

Key Technical Principles

Summing external and internal dose: TEDE

The total effective dose equivalent combines external and internal exposure. For an external deep-dose equivalent DDE and an internal committed effective dose equivalent CEDE:⁷

As a worked example, suppose a nuclear medicine technologist's dosimeter reports a deep-dose equivalent of 3.2 mSv for the year, and a bioassay following a minor intake yields a committed effective dose equivalent of 1.1 mSv:

This TEDE is compared against the occupational limit of 50 mSv (5 rem) per year in 10 CFR 20.1201. For an organ, the total organ dose equivalent is instead $\text{TODE}=\text{DDE}+\text{CDE}$, compared against the 500 mSv (50 rem) organ limit.⁷

The monitoring threshold

Whether a worker must be monitored at all follows from 10 CFR 20.1502. Monitoring is required for an adult likely to receive, in one year, a dose exceeding 10 percent of the applicable limit. For the 50 mSv TEDE limit, that threshold is:

So a worker reasonably likely to exceed 5 mSv TEDE in a year must be monitored, and once monitored, the results must be recorded on Form 5 and retained.⁶⁸ Declared pregnant workers, minors, and individuals entering certain high-radiation areas have their own monitoring triggers.⁸

Recording internal dose from intakes

External dosimetry captures only part of the picture. When a worker has a potential intake of radioactive material — for example, handling volatile I-131 or a radiopharmaceutical spill — the internal component must be assessed and recorded. Bioassay (such as a thyroid count for radioiodine or a urinalysis) is used to estimate the intake, and the intake is converted to a committed effective dose equivalent using published dose-conversion factors. The derived air concentration (DAC) and annual limit on intake (ALI) framework in 10 CFR Part 20 provides the reference intake values; one ALI corresponds to a committed effective dose equivalent of 50 mSv (5 rem), and 2,000 DAC-hours of exposure corresponds to one ALI. The resulting CEDE is entered on the same Form 5 record and added to the external DDE to form the TEDE, so a defensible occupational dose record integrates both external monitoring and internal-dose assessment rather than treating them separately.⁶⁷

ALARA investigational levels

Beyond the regulatory limits, most programs set internal ALARA investigational levels — often a Level I and a higher Level II — as action thresholds that prompt review well before a limit is approached. A common scheme sets investigational levels as fractions of the annual limit; for instance, a quarterly Level II near 30 percent of the annualized limit prompts an RSO investigation of why the dose occurred and whether it was ALARA. The dose records are the raw material for that review.⁹¹⁰

Clinical Impact

The occupational dose record is the evidence base for protecting staff and for defending the program at inspection. For a nuclear medicine or interventional program, the same records that satisfy Part 20 also drive practical protection decisions: identifying which technologists are approaching investigational levels, whether extremity doses in radiopharmacy warrant workflow changes, and whether a declared pregnant worker's monthly dose is tracking well under the gestational limit.⁹

When records are complete and current, an inspection is straightforward and staff protection decisions are data-driven. When they are not — missing monitoring periods, no annual worker notifications, unretained Form 5 records — the program faces citations and, more importantly, loses the ability to demonstrate that exposures were kept ALARA. Recordkeeping quality and radiation-safety quality are not separable.⁴

Practical Optimization Tips

Map every requirement to a retention period

The most common recordkeeping error is applying the wrong retention period. The table below summarizes key Part 20 records and reports, their triggers, and their timelines.¹²

Reconcile the dosimetry vendor report every cycle

Do not simply file the dosimetry vendor report. Reconcile it: confirm every monitored individual has a result, follow up missed or damaged badges, and enter results at least annually on Form 5 as 20.2106 requires. Gaps in the monitoring record are what inspectors find.⁶

Do not forget the worker-notification duty

Reporting to the NRC and reporting to the worker are separate obligations. Under 10 CFR 19.13, provide each monitored worker an annual written dose report, a report on request at termination of employment, and prompt advice of any dose exceeding a limit. Build the annual worker notification into the same cycle as the Form 5 update.³

Retain internal-dose documentation with the record

When an intake occurs, the bioassay data, intake assessment, and CEDE calculation are part of the defensible dose record. Retain them with the Form 5 entry so the TEDE can be reconstructed and defended.⁶⁷

Common pitfalls to avoid

• Discarding Form 5 records too soon. Individual monitoring records are kept until license termination, not 3 years.⁶
• Missing the annual worker notification. 10 CFR 19.13 is separate from NRC reporting.³
• Confusing DDE with TEDE. TEDE includes internal CEDE when there is an intake.⁷
• Overlooking the April 30 annual report where 20.2206 applies to the license.¹¹
• Not documenting the monitoring determination. Record why monitoring is or is not required under 20.1502.⁸

Regulatory Considerations

Occupational dose recordkeeping and reporting are federal requirements under 10 CFR Parts 19 and 20, implemented identically in substance by Agreement States. The RSO owns these obligations, and NUREG-1556 Volume 9 sets the NRC's program-specific expectations for medical-use licensees.¹²

• 10 CFR Part 20, Subpart L (Records). Requires records of the radiation protection program, surveys, individual monitoring results (Form 5), and public dose, with defined retention periods.¹
• 10 CFR Part 20, Subpart M (Reports). Requires notifications and reports to the NRC for incidents, doses exceeding limits, planned special exposures, and — for specified licensees — the annual individual-monitoring report.²
• 10 CFR 19.13. Requires notifications and reports to individual workers, including the annual dose report.³
• Regulatory Guide 8.7, Revision 4. Provides NRC-endorsed instructions for recording and reporting occupational radiation dose data, including completion of NRC Forms 4 and 5.⁵

Jurisdiction depends on location. Of the states DRPS serves, Florida, Maryland, Virginia, California, Nevada, Pennsylvania, New York, and New Jersey are NRC Agreement States that administer equivalent recordkeeping and reporting rules under their own radiation-control programs, while Washington DC and Delaware are regulated directly by the NRC for radioactive material. X-ray machine programs are regulated by the state radiation-control authority, which imposes parallel occupational-dose recordkeeping requirements. Always confirm the applicable rules with the authority having jurisdiction. For related program elements, see our guides to NRC occupational dose limits under Part 20 and instructions to workers under Part 19 and NRC Form 3.

Frequently Asked Questions (FAQs)

What is NRC Form 5 used for?

NRC Form 5, "Occupational Dose Record for a Monitoring Period," is the standard form for recording an individual worker's radiation dose for a monitoring period. Under 10 CFR 20.2106 the licensee records monitored doses on Form 5 or an equivalent that contains all the required information, and certain licensees also submit Form 5 to the NRC annually under 10 CFR 20.2206.

How long must occupational dose records be kept?

Records of individual monitoring results under 10 CFR 20.2106 must be retained until the Commission terminates the license. This is longer than many other Part 20 records — for example, survey records under 10 CFR 20.2103 are generally retained for 3 years. Occupational dose records effectively follow the license for its lifetime.

When must a licensee report occupational dose to the NRC?

Timelines depend on the event. Doses or levels exceeding limits are reported under 10 CFR 20.2203, generally within 30 days. Certain incidents require immediate or 24-hour notification under 10 CFR 20.2202. Specified licensees file an annual individual-monitoring report on NRC Form 5 by April 30 under 10 CFR 20.2206.

What is the difference between NRC Form 4 and NRC Form 5?

NRC Form 5 records dose for a single monitoring period. NRC Form 4, "Cumulative Occupational Dose History," compiles a worker's lifetime cumulative dose, used when a licensee must determine prior occupational dose. Regulatory Guide 8.7 provides NRC-endorsed instructions for completing both forms.

What dose quantities go on an occupational dose record?

An occupational dose record captures the deep-dose equivalent (DDE), lens dose equivalent (LDE), shallow-dose equivalent to the whole body and to the maximally exposed extremity (SDE), committed dose equivalent and committed effective dose equivalent (CDE and CEDE) for internal intakes, and the summed total effective dose equivalent (TEDE) and total organ dose equivalent (TODE).

When must workers be monitored for occupational dose?

Under 10 CFR 20.1502, monitoring is required for adults likely to receive, in a year, a dose exceeding 10 percent of the applicable limits, and for declared pregnant workers, minors, and individuals entering high-radiation areas under specified conditions. If monitoring is required, the results must be recorded and retained.

Must licensees report dose to individual workers?

Yes. Under 10 CFR 19.13, licensees must provide monitored workers an annual written report of their dose, provide a report on the worker's request when they terminate employment, and advise workers of any dose that exceeds a limit. This worker-notification duty is separate from reporting to the NRC.

Key Takeaways

• Occupational dose recordkeeping and reporting live in 10 CFR Part 20 Subparts L and M, with worker notification in 10 CFR 19.13.¹²³
• Individual monitoring results are recorded on NRC Form 5 and retained until license termination, not for a fixed 3-year period.⁶
• TEDE = DDE + CEDE; monitoring is required above 10 percent of the applicable limit (5 mSv for the 50 mSv TEDE limit).⁷⁸
• Reporting timelines vary: immediate/24-hour for incidents, generally 30 days for exceeding limits, and April 30 annually for specified licensees' Form 5 submission.²¹¹
• NRC Form 4 compiles lifetime cumulative dose; Form 5 covers a monitoring period; Regulatory Guide 8.7, Rev. 4, gives the instructions for both.⁵
• Reporting to the worker under 10 CFR 19.13 is a separate obligation from reporting to the NRC.³

Conclusion

Occupational dose recordkeeping is deceptively simple and frequently mishandled. The regulations are explicit: record individual monitoring on NRC Form 5, retain it until the license terminates, report doses that exceed limits within defined timelines, submit the annual Form 5 report where required, and give every monitored worker an annual written dose report. A program that maps each requirement to its citation, retention period, and timeline — and reconciles its dosimetry every cycle — turns recordkeeping from an inspection liability into evidence that exposures were kept ALARA. That is the difference between a program that merely monitors dose and one that can prove it protected its workers.¹³⁵

How DRPS Can Help

Diagnostic Radiation Physics Services helps facilities build defensible radiation-safety recordkeeping through radiation safety officer consulting, dosimetry-program review and reconciliation, occupational-dose record and Form 5 audits, worker-notification workflows, and radiation safety training across Florida, Maryland, Virginia, Washington DC, California, Nevada, Pennsylvania, New York, New Jersey, and Delaware.

A strong recordkeeping program is not about surviving the next inspection. It is about being able to demonstrate, at any moment, that your workers' doses were monitored, recorded, reported, and kept as low as reasonably achievable.

Related Resources

• NRC occupational dose limits under Part 20
• Occupational exposure monitoring
• OSL and TLD personnel dosimetry
• Instructions to workers: Part 19 and NRC Form 3
• Building an ALARA program
• Annual radiation protection program audit
• Radiation Safety Officer consulting
• Radiation safety training

References

1. U.S. Nuclear Regulatory Commission. 10 CFR Part 20, Subpart L — Records. ecfr.gov
2. U.S. Nuclear Regulatory Commission. 10 CFR Part 20, Subpart M — Reports. ecfr.gov
3. U.S. Nuclear Regulatory Commission. 10 CFR 19.13 — Notifications and reports to individuals. ecfr.gov
4. U.S. Nuclear Regulatory Commission. Consolidated Guidance About Materials Licenses: Program-Specific Guidance About Medical Use Licenses. NUREG-1556, Volume 9, Revision 3. nrc.gov
5. U.S. Nuclear Regulatory Commission. Regulatory Guide 8.7, Revision 4: Instructions for Recording and Reporting Occupational Radiation Dose Data. nrc.gov
6. U.S. Nuclear Regulatory Commission. 10 CFR 20.2106 — Records of individual monitoring results. ecfr.gov
7. U.S. Nuclear Regulatory Commission. 10 CFR 20.1201 — Occupational dose limits for adults. ecfr.gov
8. U.S. Nuclear Regulatory Commission. 10 CFR 20.1502 — Conditions requiring individual monitoring of external and internal occupational dose. ecfr.gov
9. U.S. Nuclear Regulatory Commission. Regulatory Guide 8.10: Operating Philosophy for Maintaining Occupational Radiation Exposures As Low As Is Reasonably Achievable. nrc.gov
10. U.S. Nuclear Regulatory Commission. NRC Form 5: Occupational Dose Record for a Monitoring Period. nrc.gov
11. U.S. Nuclear Regulatory Commission. 10 CFR 20.2206 — Reports of individual monitoring. ecfr.gov
12. U.S. Nuclear Regulatory Commission. 10 CFR 20.2203 — Reports of exposures, radiation levels, and concentrations of radioactive material exceeding the constraints or limits. ecfr.gov