10 CFR § 835.206 - Limits for the embryo/fetus.

---
identifier: "/us/cfr/t10/s835.206"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 835.206 - Limits for the embryo/fetus."
title_number: 10
title_name: "Energy"
section_number: "835.206"
section_name: "Limits for the embryo/fetus."
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"
---


# 835.206 Limits for the embryo/fetus.

(a) The equivalent dose limit for the embryo/fetus from the period of conception to birth, as a result of occupational exposure of a declared pregnant worker, is 0.5 rem (0.005 Sv).

(b) Substantial variation above a uniform exposure rate that would satisfy the limits provided in § 835.206(a) shall be avoided.

(c) If the equivalent dose to the embryo/fetus is determined to have already exceeded 0.5 rem (0.005 Sv) by the time a worker declares her pregnancy, the declared pregnant worker shall not be assigned to tasks where additional occupational exposure is likely during the remaining gestation period.

[58 FR 65485, Dec. 14, 1993, as amended at 72 FR 31926, June 8, 2007]