United Nuclear- Radioactive Isotopes

Supplying the science hobbyist, industry, government, schools & universities since 1998.
"We specialize in small orders"
Nuclear Isotopes
Safety Sealed, Radioactive Sources

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If you're looking for a clean, accurate, radiation sources, here they are...

No NRC license required!
All our radioactive isotopes are legal to purchase & own by the general public.
They require no special licensing, handling, storage or disposal.

To ensure the longest half-life possible, we do NOT keep isotopes in stock.
All isotopes are fabricated to order and shipped directly to you from the
NRC licensed nuclear isotope manufacturer in Oak Ridge, TN.

Individual Isotope Disk Sources
Radioactive material is sealed in the plastic/epoxy to prevent leakage and contamination.
These sealed plastic disks measure 1" in diameter and just under 1/8" thick.

All Isotopes are sold by the microcurie (uCi)
( 1 microcurie = 2.22 x 10E6 disintegrations / minute = 2,220,000 cpm )

ISOTOPE	ACTIVITY	HALF-LIFE	ENERGIES (KeV)
Barium¹³³	1uCi	10.7 years	81.0, 356.0
Cadmium¹⁰⁹	1uCi	453 days	88.0
Cobalt⁵⁷	1uCi	270 days	122.1
Cobalt⁶⁰	1uCi	5.27 years	1173.2, 1332.5
Europium¹⁵²	1uCi	13.5 years	121.8, 344.3, 1408.0
Manganese⁵⁴	1uCi	312 days	834.8
Sodium²²	1uCi	2.6 years	511.0, 1274.5
Zinc⁶⁵	1uCi	244 days	511.0, 1115.5

ISOTOPE	ACTIVITY	HALF-LIFE	ENERGIES (KeV)
Strontium⁹⁰	0.1uCi	28.5 years	546.0
Thallium²⁰⁴	1uCi	3.78 years	763.4

Large Beta-only radiation emitters
(These sources are larger disks measuring 1.75" in diameter and just under 1/8" thick).

ISOTOPE	ACTIVITY	HALF-LIFE	ENERGIES (KeV)
Carbon¹⁴	10uCi	5730 years	49.5 (average)

ISOTOPE	ACTIVITY	HALF-LIFE	ENERGIES (KeV)
Iron⁵⁵	100uCi	2.73 years	5.2 (average)

Alpha-only radiation emitters
The alpha source is of open window construction with the source material bonded to the
surface of a silver foil mounted in the recess of the plastic disc. This design yields excellent
emission of alpha particles without window losses

ISOTOPE	ACTIVITY	HALF-LIFE	ENERGIES (KeV)
Polonium²¹⁰	0.1uCi	138 days	5304.5

Multiple radiation emitters
Cs¹³⁷ is the most common source used to test radiation detection equipment.

ISOTOPE	ACTIVITY	HALF-LIFE	EMISSION	ENERGIES (KeV)	PRICE
Cesium¹³⁷	1uCi	30.1 years	Gamma & Beta	G: 32, 661.6 B: 511.6, 1173.2	$79.00
Cesium¹³⁷	5uCi	30.1 years	Gamma & Beta	G: 32, 661.6 B: 511.6, 1173.2	$90.00
Cesium¹³⁷	10uCi	30.1 years	Gamma & Beta	G: 32, 661.6 B: 511.6, 1173.2	$110.00

ISOTOPE	ACTIVITY	HALF-LIFE	EMISSION	ENERGIES (KeV)
Polonium²¹⁰ Strontium⁹⁰ Cobalt⁶⁰	0.1uCi 0.1uCi 1uCi	138 days 28.5 years 5.27 years	Alpha Beta Gamma	5304.5 546.0 1173.2, 1332.5

ISOTOPE	ACTIVITY	HALF-LIFE	EMISSION	ENERGIES (KeV)
Polonium²¹⁰ Strontium⁹⁰ Thallium²⁰⁴ Cobalt⁶⁰ Cesium¹³⁷	0.1uCi 0.1uCi 1uCi 1uCi 1uCi	138 days 28.5 years 3.78 years 5.27 years 30.1 years	Alpha Beta Beta Gamma Gamma & Beta	5304.5 546.0 763.4 1173.2, 1332.5 G: 32, 661.6 B: 511.6, 1173.2

8 Disk Set

Contains 8 gamma sources for scintillation spectrometry. One is a mixed source (Cs/ZnS),
marked 'unknown' for student identification. Set includes 1 each of the following sources:

ISOTOPE	ACTIVITY	HALF-LIFE	EMISSION	ENERGIES (KeV)
Barium¹³³ Cadmium¹⁰⁹ Cobalt⁵⁷ Cobalt⁶⁰ Cesium¹³⁷ Manganese⁵⁴ Sodium²² Cs/Zn	1uCi 1uCi 1uCi 1uCi 1uCi 1uCi 1uCi 1uCi	10.7 years 453 days 270 days 5.27 years 30.1 years 312 days 2.6 years mixed	Gamma Gamma Gamma Gamma Gamma & Beta Gamma Gamma Gamma & Beta	81.0, 356.0 88.0 122.1 1173.2, 1332.5 G: 32, 661.6 B: 511.6, 1173.2 834.8 511.0, 1274.5 mixed

Needle Sources
These sources are constructed by depositing a small quantity of radioactive isotope onto
the eye of a standard sewing needle which is mounted on a test tube stopper for insertion
into a Cloud Chamber. The needle and stopper are placed into test tube for protection
during shipping and storage.

	Strontium-90 Needle Source Emits low energy Beta radiation (electrons). Their paths can be deflected by powerful Neodymium (Nd) magnets.	$50.00
	Polonium-210 Needle Source Emits strong Alpha radiation (particles) and produces impressive, thick condensation trails.	$50.00
	Lead-210 Needle Source Emits both Alpha and Beta radiation for a variety of experiments. Long half-life of over 20 years.	$50.00

Nuclear Isotope Generator

Create a radioactive isotope and demonstrate the properties of radioactive decay.

This Cs-137/Ba-137m Isotope Generator is used to conduct experiments to demonstrate the properties of radioactive decay. Based on the original Union Carbide patented design, it offers exceptional performance combined with ease of use and safe operation.

Each isotope generator contains 10uCi. of Cs-137 (an NRC 'exempt quantity') making if free from specific State and Federal licensing. The generator can produce up to 1000 small aliquots of the short lived Ba-137m isotope with a half-life of 2.6 minutes. Each generator is supplied with 250 ml of eluting solution and additional solution may be ordered separately. The parent isotope Cs-137 with a half-life of 30.1 years beta decays (94.6%) to the metastable state of Ba-137m. This further decays by gamma emission (662 keV) with a half-life of 2.6 min. to the stable Ba-137 element. During elution, the Ba-137m is selectively "milked" from the generator leaving behind the Cs-137 parent. Regeneration of the Ba-137m occurs as the Cs-137 continues to decay, re-establishing equilibrium in less than 1 hour.

Approximately 30 minutes after elution, the residual activity of the Ba-137m sample has decayed to less than one thousandth of its initial activity making it safe for disposal. When used with the eluting solution supplied, bleed through of the parent Cs-137 is less than 50 Bq/ml, affording a long working life. Each kit is supplied with the generator, syringe, tube, 250ml of solution and a convenient storage case.

Replacement Eluting Solution, 250 ml: $20.00