Beta Particle Standards—Type MF2

This is a “scatterless” configuration in which the activity is applied as a 0.12” (3 mm) spot centered between two laminated 0.9 mg/cm2 aluminized Mylar foils. The source is supplied in a removable aluminum holder. In the holder the source has an overall diameter of 1” (25.4 mm) and a thickness of 0.125” (3.18 mm). Out of the holder the source is 0.937” (23.8 mm) in diameter with a thickness of approximately 0.030” (0.76 mm).

This configuration is most useful for the precise determination of G.M. and proportional counter efficiencies, and as an educational tool for the verification of the inverse square law, as well as demonstrating back-scatter phenomena. 

1”

0.12”

0.125”

25.4 mm

3 mm

3.18 mm

Evaporated Salts on Mylar

5 nCi -100 nCi (185 Bq -3.7 kBq)

Bi-210 : 10 nCi -100 nCi (370 Bq -3.7 kBq)Sr-90 : 2.5 nCi -100 nCi (92.5 Bq -3.7 kBq)

C-14

BF-014-MF2

370 Bq – 37 kBq

Cs-137

BF-137-MF2

370 Bq – 37 kBq

Cl-36

BF-036-MF2

370 Bq – 37 kBq

Co-60

BF-060-MF2

370 Bq – 37 kBq

Ge-68¹⁾

370 Bq – 37 kBq

Na-22

BF-022-MF2

370 Bq – 37 kBq

Pm-147

BF-147-MF2

370 Bq – 37 kBq

Ru-106/Rh-106

BF-106-MF2

370 Bq – 37 kBq

Sr-90/Y-90²⁾

BF-090-MF2

370 Bq – 18,5 kBq

maximum activity

Tc-99

BF-099-MF2

370 Bq – 37 kBq

Tl-204

BF-204-MF2

370 Bq – 37 kBq