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2 PCS. GEIGER COUNTER TEST SOURCES 3000 - 4000 CPM THORIUM Lantern Mantles, US $7.77 – Picture 0
2 PCS. GEIGER COUNTER TEST SOURCES 3000 - 4000 CPM THORIUM Lantern Mantles, US $7.77 – Picture 1
2 PCS. GEIGER COUNTER TEST SOURCES 3000 - 4000 CPM THORIUM Lantern Mantles, US $7.77 – Picture 0
2 PCS. GEIGER COUNTER TEST SOURCES 3000 - 4000 CPM THORIUM Lantern Mantles, US $7.77 – Picture 1

2 Pcs. Geiger Counter Test Sources 3000 - 4000 Cpm Thorium Lantern Mantles

US $7.77

  • European Union, Bulgaria
  • Jun 9th
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Up for sale are 2 ( two) pcs. Thoriated lantern mantles suitable for geiger counter testing, each one produces between 3000 and 4000 CPM. All measurements were taken using a geiger meter with SBM20 tube with no shield on the surface of the package. Your CPM reading may be slightly higher or lower depending on the sensitivity of your Geiger counter and the distance from the mantle. The diameter of the mantles are about 7cm. or 2.76in. If sufficient time elapses after a sample of 232Th is obtained and if no radon diffuses away, the various radioactive species in the 232Th + 208Pb decay chain will be present in the thorium deposit in secular equilibrium. That is, if we ignore the extremely long-term declining source strength of the 232Th sample, in any given time interval there will be as many transitions leading to the formation of some particular isotope as there will be decays of that isotope. At true equilibrium, transition rates into and out of each isotope within the chain must be the same, otherwise the number of those nuclei would be increasing or decreasing and equilibrium would not have been established.  We use mail with tracking number. If you have any questions, please feel free to ask. We will be happy to help.

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