"Now shipping software for Windows XP, 7 & 8, 32- and 64-bit"


Upcoming Events & Workshops

What's New


Lead Shields

Exempt Radioisotope Sources

Instrument Manuals

Application Software

Dealers & Pricing

Order Form

Email Order Form

Request Quotation

Associations & Links

Contact Us


Terms & Conditions

Contact Us

Tube & Rod Sources for Well Crystals

qs_rlbr.gif (2244 bytes)

NRC 30.18 Exempt quantities (narrative)
NRC 30.71 Schedule B Exempt Quantity Radionuclide Regulations (Table)
  MSDS/Data Sheet for Sources
We now offer a selection of exempt quantity gamma sources encapsulated in standard size test tubes or rods for use with well type radiation detectors.

These sources are exempt sources and of nominal activity. The isotope is deposited as a point source in the bottom of the tube and is then sealed with epoxy.


tubesources.jpg (20808 bytes)
Two tube sizes are stocked as standard, 13x100mm and 12x75mm, which is shipped as the standard if the other size is not specified. Rods are available as 5" x 0.375" -which will be shipped as the standard if the 0.5" diameter rod is not specified and 5" x 0.5".

 Activity for Test Tube and Rod sources is recommended at 0.1 uCi.

NOTE: All sources are +/- 20% nominal activity; +/- 5% activity calibration for gamma sources is available at extra charge. See here. Contact us for pricing or additional information.

Higher activity sources to be used in a well detector may cause the detector to give false data or multiple peaks.

Other activities are available on special order up to the maximum  NRC Exempt Quantities. Please contact factory for available activity and cost.

Tube and rod sources may be order as Calibrated against the NIST Mixed Gamma Standard, SRM 4275C-125 for an additional, nominal charge.

Isotopes may be selected from the following table. Order by the model number, under either Tube or Rod source.





Energies (keV)









10.7 years

81.0, 276.3, 303.7, 355.9, 383.7




453 days





270 days

122.1, 136.4




5.27 years

1173.2, 1332.5




30.1 years

32, 661.6




312 days





2.6 years





244 days


How to Dispose of Exempt Sources - FOR INTERNATIONAL CUSTOMERS

 1) Disposal Service, Click here (PDF Document) 2) USNRC Rule for Disposal of Exempt Sources, Click here (PDF Document)

qs_rlbr.gif (2244 bytes)

 Home | Upcoming Events & Workshops  |  What's New  |  Products  |  Lead Shields  |  Exempt Radioisotope Sources  | Instrument Manuals & Software  |  Dealers & Pricing  |  Order Forms  |  Associations & Links | Table of Contents  | Send E-Mail  |  Contact Us  |  Search  | Terms & Conditions  |

Copyright 2001-2015 by Spectrum Techniques - ALL RIGHTS RESERVED