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Geiger Counter Experiment #4

Energy Spectrum of Strontium 90 Beta Radiation Source


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We classify the beta energy spectrum as the intensity of a beta beam at different particle energies. Strontium 90 emits two beta energies, one at 0.546 MeV and the other at 2.28 MeV, see chart below.



SR90 Chart Beta Energy Decay

Using a .001 brass shield one can separate the 0.56 MeV from the 2.28 MeV beta particles from an SR-90 source. The 0.56 MeV can be blocked using a simple shield. We can measure the difference using an accurate CPM count from a geiger counter.


See chart below.

Strontium Beta decay experiment

Open Shield with 1 Mil (.001) Brass Shield
Sample Distance Count CPM Sample Distance Count CPM
Sample 1 2" 370 Sample 1 2" 244
Sample 2 " 400 Sample 2 " 251
Sample 3 " 403 Sample 3 " 247
Sample 4 " 382 Sample 4 " 246
Sample 1 3" 219 Sample 1 3" 135
Sample 2 " 206 Sample 2 " 149
Sample 3 " 194 Sample 3 " 121
Sample 4 " 195 Sample 4 " 120
Sample 1 4" 127 Sample 1 4" 77
Sample 2 " 119 Sample 2 " 98
Sample 3 " 124 Sample 3 " 87
Sample 4 " 134 Sample 4 " 82


Results

Average CPM with no shield Average CPM with 1 Mil (.001) Brass Shield % reduction in measured radiation
2" 404 176 44%
3" 164 84 51%
4" 100 55 55%

 



Strontium 90 Source

Description Activity Half-Life Item# Price
Strontium-90
0.1uCi
28.5 years
SR-90-S
$79.95
Primary Radiation Type
Energies KeV
Secondary Radiation Type(s)
Beta (β)
546
N/A

Radioactive isotopes are drop-shipped from a different location & can not be returned or refunded.

SR-90 - $79.95
Strontium 90 Radioactive Source

SH-06 - $9.95
1 Mil Brass Shield for Geiger Counter Wand

.001-Brass - $2.95
1 mill brass sheet 1.5 inches square




* All Radioisotope & Uranium Ore orders are shipped via EMS. Except orders going to Canada, which are shipped FedEx Economy. Call or email for pricing