Improved method for determination of helium-4 in helium-3 by mass spectrometry
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Improved method for determination of helium-4 in helium-3 by mass spectrometry

Filetype[PDF-412.28 KB]


  • English

  • Details:

    • Description:
      "This U.S. Bureau of Mines report describes a method for determining parts per million (ppm) of helium-4 (he-4) in helium-3 (he-3) to an accuracy of +/-5 pct by mass spectrometry. Gravimetrically prepared primary standards were used for the calibration of a dempster 180 deg magnetic sector mass spectrometer. A comparison between a 2.49 pct he-4 in hydrogen mixture and a 2.49 pct he-4 in he-3 mixture shows that he-3 can be replaced with hydrogen as a diluent for standards with comparable mass spectrometry sensitivities for he-4. Using hydrogen as a diluent allows analysis of he-3 samples for he-4 when he-3 for preparation of standards is not available and also conserves the rare he-3 isotope. Standards of he-4 in h2 were prepared for calibration of the mass spectrometer for quantitative determinations of he-4 in the 2- to 100-ppm range. A minimum detectable limit of 2 ppm he-4 is obtained by this method." - NIOSHTIC-2

      NIOSHTIC no. 10006969

    • Document Type:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at stacks.cdc.gov