Difference between revisions of "Cf-252 FTC-CFZ-431"
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4.2 <math>\mu g</math> would generate <math>9.67 \times 10^{6}</math> neutrons per second. The discrepancy between these two numbers gives a 2% error. | 4.2 <math>\mu g</math> would generate <math>9.67 \times 10^{6}</math> neutrons per second. The discrepancy between these two numbers gives a 2% error. | ||
| − | = | + | =Initial source composition= |
CF252 used in the US is produced in batches at Oak Ridge National Laboratory which all have similar isotopic make up. I found the isotopic composition of a batch produced in 1991, two years before the production date of our source<ref> http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-12-22883 </ref>. Assuming our source has the same isotopic composition as the 1991 batch and a total mass of 4.2 <math>\mu</math>g, the values in the following table can be calculated. | CF252 used in the US is produced in batches at Oak Ridge National Laboratory which all have similar isotopic make up. I found the isotopic composition of a batch produced in 1991, two years before the production date of our source<ref> http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-12-22883 </ref>. Assuming our source has the same isotopic composition as the 1991 batch and a total mass of 4.2 <math>\mu</math>g, the values in the following table can be calculated. | ||
| + | |||
| + | |||
| + | {| border="2" | ||
| + | !rowspan="2"| nuclide !! rowspan="2"| Atom % !! rowspan="2"|NAtoms in 1993 <math>\times 10^{15}</math> !! rowspan="2"|<math>T_{1/2}</math> [y] !! colspan="2" | decays <math>[s^{-1}]</math> | ||
| + | |- | ||
| + | !<math>\alpha</math>!! SF | ||
| + | |- | ||
| + | ! <math>^{249}Cf</math> | ||
| + | | 3.41 || - || 351 | ||
| + | |- | ||
| + | |} | ||
=Table of rates= | =Table of rates= | ||
Revision as of 20:44, 19 January 2017
Overview
An official document for the CF-252 source with serial number FTC-CFZ-431 provides a value for the neutron rate and CF-252 mass as of 03/19/1993.
The initial neutron rate and mass of cf-252 are stated to be and 4.2, respectively.
4.2 would generate neutrons per second. The discrepancy between these two numbers gives a 2% error.
Initial source composition
CF252 used in the US is produced in batches at Oak Ridge National Laboratory which all have similar isotopic make up. I found the isotopic composition of a batch produced in 1991, two years before the production date of our source<ref> http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-12-22883 </ref>. Assuming our source has the same isotopic composition as the 1991 batch and a total mass of 4.2 g, the values in the following table can be calculated.
| nuclide | Atom % | NAtoms in 1993 | [y] | decays | |
|---|---|---|---|---|---|
| SF | |||||
| 3.41 | - | 351 | |||
Table of rates
Click here to open a table giving neutron rates and C-252 activity from dates 1/2017 to 12/2029. This calculation only includes neutrons from Cf-252, since all other daughter nuclei and possible impurities have a very low SF rate compared to Cf-252.
Formulas
Formula used for neutron rate []:
and for Cf-252 activity []:
References
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