ADR special provision 373
Neutron radiation detectors with boron trifluoride: per-detector limits, packing rules and a document statement; ≤ 1 g units are outside ADR.
Neutron radiation detectors containing boron trifluoride gas that is not under pressure may use this entry when conditions (a) to (c) are met. Packing instruction P200 does not apply, and the transport document must carry the special provision 373 statement. Detectors holding at most 1 g of boron trifluoride, solder glass jointed types included, are exempt from ADR when they satisfy (a) and are packed as in (b). Detection systems containing such detectors are exempt when packed as in (c).
| Value | Applies when |
|---|---|
| 105 kPa absolute at 20 °C | maximum pressure per detector |
| 13 g | maximum gas per detector |
| 1800 kPa | minimum burst pressure from design type qualification |
| 1 × 10-10 cm³/s | leaktightness standard before filling |
| 1.8 m | drop test for packages and system packagings |
| 52 g | maximum total gas per outer packaging |
| 1 g | boron trifluoride content at or below which the exemption applies |
Conditions
- (a) Each detector: at most 105 kPa absolute at 20 °C; at most 13 g of gas; made under a registered quality assurance programme (ISO 9001 may serve); welded metal with brazed metal-to-ceramic feed-throughs and a burst pressure of at least 1800 kPa shown by design type qualification; leak-tested to 1 × 10-10 cm³/s before filling.
- (b) Detectors carried as separate components: in a sealed intermediate plastics liner with enough absorbent or adsorbent to take up all the gas; in strong outer packaging, the package surviving a 1.8 m drop with no gas leaking from detectors; no more than 52 g of gas in total per outer packaging.
- (c) Complete detection systems with detectors meeting (a): detectors in a strong sealed outer casing holding enough absorbent or adsorbent for all the gas; systems in strong outer packagings able to survive a 1.8 m drop without leakage, unless the casing gives equivalent protection.
| documents | Transport document statement: "Transport in accordance with special provision 373" |
|---|
Note. The provision runs from page 631 to page 632. The detector leaktightness standard is 1 × 10⁻¹⁰ cm³/s. Symbols checked against a UTF-8 text extraction of the page.
Refers to: P200.
Carried by 1 Table A entry
Source: ADR 2025 (ECE/TRANS/352), Volume I, section 3.3.1, special provision 373, page 631.
Paraphrase in FreightUtils' own words, not the official text. Not yet reviewed.
ADR 2027 amendments (accepted, applying from 1 January 2027) are not yet reflected on this page.