49 CFR 172 Special Provision 238 (Numeric Codes)

These provisions are multi-modal and apply to bulk and non-bulk packagings.
Code238
DescriptionNeutron radiation detectors:
  • a. Neutron radiation detectors containing non-pressurized boron trifluoride gas in excess of 1 gram and radiation detection systems containing such neutron radiation detectors as components may be transported by highway, rail, vessel, or cargo aircraft in accordance with the following:
    • (1) Each radiation detector must meet the following conditions:
      • (i) The pressure in each neutron radiation detector must not exceed 105 kPa absolute at 20 [deg]C;
      • (ii) The amount of gas must not exceed 13 grams per detector; and
      • (iii) Each neutron radiation detector must be of welded metal construction with brazed metal to ceramic feed through assemblies. These detectors must have a minimum burst pressure of 1800 kPa as demonstrated by design type qualification testing; and
      • (iv) Each detector must be tested to a 1 x 10-\10\ cm\3\/s leaktightness standard before filling.
    • (2) Radiation detectors transported as individual components must be transported as follows:<
      • (i) They must be packed in a sealed intermediate plastic liner with sufficient absorbent material to absorb the entire gas contents.
      • (ii) They must be packed in strong outer packagings and the completed package must be capable of withstanding a 1.8 meter (6-foot) drop without leakage of gas contents from detectors.
      • (iii) The total amount of gas from all detectors per outer packaging must not exceed 52 grams.
    • (3) Completed neutron radiation detection systems containing detectors meeting the conditions of paragraph (a)(1) of this special provision must be transported as follows:
      • (i) The detectors must be contained in a strong sealed outer casing;
      • (ii) The casing must contain include sufficient absorbent material to absorb the entire gas contents;
      • (iii) The completed system must be packed in strong outer packagings capable of withstanding a 1.8 meter (6-foot) drop test without leakage unless a system's outer casing affords equivalent protection.
  • b. Except for transportation by aircraft, neutron radiation detectors and radiation detection systems containing such detectors transported in accordance with paragraph (a) of this special provision are not subject to the labeling and placarding requirements of part 172 of this subchapter.
  • c. When transported by highway, rail, vessel, or as cargo on an aircraft, neutron radiation detectors containing not more than 1 gram of boron trifluoride, including those with solder glass joints are not subject to any other requirements of this subchapter provided they meet the requirements in paragraph (a)(1) of this special provision and are packed in accordance with paragraph (a)(2) of this special provision. Radiation detection systems containing such detectors are not subject to any other requirements of this subchapter provided they are packed in accordance with paragraph (a)(3) of this special provision.
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