10 CFR § 835.403 - Air monitoring.

---
identifier: "/us/cfr/t10/s835.403"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 835.403 - Air monitoring."
title_number: 10
title_name: "Energy"
section_number: "835.403"
section_name: "Air monitoring."
chapter_name: "DEPARTMENT OF ENERGY"
part_number: "835"
part_name: "OCCUPATIONAL RADIATION PROTECTION"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
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"
---


# 835.403 Air monitoring.

(a) Monitoring of airborne radioactivity shall be performed:

(1) Where an individual is likely to receive an exposure of 40 or more DAC-hours in a year; or

(2) As necessary to characterize the airborne radioactivity hazard where respiratory protective devices for protection against airborne radionuclides have been prescribed.

(b) Real-time air monitoring shall be performed as necessary to detect and provide warning of airborne radioactivity concentrations that warrant immediate action to terminate inhalation of airborne radioactive material.

[63 FR 59683, Nov. 4, 1998]