10 CFR § 835.603 - Radiological areas and radioactive material areas.

---
identifier: "/us/cfr/t10/s835.603"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 835.603 - Radiological areas and radioactive material areas."
title_number: 10
title_name: "Energy"
section_number: "835.603"
section_name: "Radiological areas and radioactive material areas."
chapter_name: "DEPARTMENT OF ENERGY"
part_number: "835"
part_name: "OCCUPATIONAL RADIATION PROTECTION"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 2201, 7191; 50 U.S.C. 2410."
regulatory_source: "58 FR 65485, Dec. 14, 1993, unless otherwise noted."
cfr_part: "835"
---


# 835.603 Radiological areas and radioactive material areas.

Each access point to radiological areas and radioactive material areas (as defined at § 835.2) shall be posted with conspicuous signs bearing the wording provided in this section.

(a) *Radiation area.* The words “Caution, Radiation Area” shall be posted at each radiation area.

(b) *High radiation area.* The words “Caution, High Radiation Area” or “Danger, High Radiation Area” shall be posted at each high radiation area.

(c) *Very high radiation area.* The words “Grave Danger, Very High Radiation Area” shall be posted at each very high radiation area.

(d) *Airborne radioactivity area.* The words “Caution, Airborne Radioactivity Area” or “Danger, Airborne Radioactivity Area” shall be posted at each airborne radioactivity area.

(e) *Contamination area.* The words “Caution, Contamination Area” shall be posted at each contamination area.

(f) *High contamination area.* The words “Caution, High Contamination Area” or “Danger, High Contamination Area” shall be posted at each high contamination area.

(g) *Radioactive material area.* The words “Caution, Radioactive Material(s)” shall be posted at each radioactive material area.

[63 FR 59684, Nov. 4, 1998]