Cesium-137 (Cs-137) for Oil Well Logging.

We also offer Industrial Cs-137 Gamma Sources

QSA Global, Inc. has manufactured thousands of sealed Cesium-137 (Cs-137) density sources for notable oilfield service companies worldwide for oil well logging (OWL) including Schlumberger®, Halliburton®, Weatherford®, and Baker Hughes® as well as numerous independent tool manufacturers for over 60 years.

Achieve fast, accurate density measurements in Wireline, Measurement While Drilling (MWD), and Logging While Drilling (LWD) applications with superior design features such as:

A rattle-free design to ensure a fixed center of activity, resulting in consistent, precise measurements.
Highly insoluble fused glass provides maximum environmental safety.
The smallest focal on the market for more accurate measurements.

OWL Cs-137 Key Specifications

Radiation Type	High-Energy Gamma Source
Measurement	Density
Standard Activity	Up to 2.5 Ci (92.5 GBq)
Gamma Ray Energy	0.662 MeV
Half-Life	30.17 years
Gamma Dose Rate	320 mrem/hr/Ci at 1 m 86.4 µSv/hr/GBq at 1 m
Recommended Working Life	15 years

Your Experts in Custom Cs-137 Source Design

QSA Global, Inc.'s technical experts excel at designing custom sealed Cs-137 sources to integrate with your bull plugs and pressure vessels for oil well logging applications. We provide recommendations on superior materials better suited for high temperature, high pressure, or corrosive environments. We also offer technical guidance on capsule dimensions, interface, assembly, and specific handling features that work best for your requirements. The following are just a few examples of our most commonly requested Cs-137 sealed sources.

Capsule Code: X2170

US Model #: CDC.CY3

Activity	1.78 Ci (+0%/-15%)
Tolerance (Output)	1.42 x 10³ nGy/s (+0%/-15%)
Double Encapsulated	MP35N
Special Form Certificate	USA/0650/S-96
ISO/ANSI Rating	C6X646 (X=60,000 psi)

Capsule Code: X2063

US Model #: CDC.CY6

Activity	1.78 Ci (+0%/-15%)
Tolerance (Output)	1.42 x 10³ nGy/s (+0%/-15%)
Double Encapsulated	ARMCO 17-4 PH Stainless Steel
Special Form Certificate	USA/0650/S-96
ISO/ANSI Rating	C6X646 (X=60,000 psi)

Capsule Code: X2112/3

US Model #: CDC.CY13

Activity	2.00 Ci (±20%)
Tolerance (Output)	1.60 x 10³ nGy/s (±20%)
Double Encapsulated	ARMCO 17-4 PH Stainless Steel
Special Form Certificate	USA/0650/S-96
ISO/ANSI Rating	C6X646 (X=60,000 psi)

Capsule Code: X2178

US Model #: CDC.CY16

Activity	2.00 Ci (+10%/-10%)
Tolerance (Output)	1.60 x 10³ nGy/s (±10%)
Double Encapsulated	MP35N
Special Form Certificate	USA/0650/S-96
ISO/ANSI Rating	C66646

Capsule Code: X2080

US Model #: CDC.CY11

Activity	1.5 Ci (+10%/-10%)
Tolerance (Output)	1.20 x 10³ nGy/s (±10%)
Double Encapsulated	ARMCO 17-4 PH Stainless Steel
Special Form Certificate	USA/0612/S-96
ISO/ANSI Rating	C66646

Capsule Code: X2074

US Model #: CDC.CY4

Activity	2.00 Ci (+20%/-20%)
Tolerance (Output)	1.60 x 10³ nGy/s (±20%)
Double Encapsulated	ARMCO 17-4 PH Stainless Steel
Special Form Certificate	USA/0612/S-96
ISO/ANSI Rating	C66646

Cs-137 Sealed Source Integrity Testing

QSA Global, Inc.'s sealed Cs-137 sources are manufactured with high-performance materials, such as MP35N and 17-4 PH stainless steel for outstanding durability, corrosion resistance, and extremely high tensile strength. 17-4 PH stainless steel provides magnetic properties to facilitate source retrieval. All of our Cs-137 sources are tested according to ISO 2919/ANSI N43.6 standards. We can perform high-pressure testing up to 60,000 PSI (414 MPa), which is well beyond the class 6 pressure requirement of 24,656 PSI (170 MPa). We can also perform temperature testing to the maximum class 6 requirement of 800° C for 1 hour.The following are just a few of the tests we perform:

ISO 2919 Class 6 Puncture Test: 2.2 lbs (1 kg) from 3.3 ft (1 m) or equivalent imparted energy

ISO 2919 low-temperature test with liquid nitrogen (-196°C)

Post low-temperature test with liquid nitrogen

ISO 2919 Class 6 High Temperature test to 800°C for 1 hour

ISO 2919 Class 6 Temperature Test: Thermal shock from 800°C to 20°C (in water)

Post ISO 2919 Class 6 thermal shock test

Sealed Cs-137 Source FAQs

Does QSA Global, Inc. manufacture bull plugs and pressure vessels for a turnkey product?
Yes. We offer turnkey services and manufacture Cs-137 sealed sources to your unique specifications. We can also load your bull plugs and pressure vessels with Cs-137 sealed sources and dropship them to the end-user.
How many encapsulations are oil well and borehole logging sealed Cs-137 sources?
At a minimum, our sealed Cs-137 sources are double encapsulated and, most times, triple encapsulated.
Are your sealed Cs-137 sources Special Form or Normal Form?
All of QSA Global, Inc.’s Cs-137 sources carry Special Form approvals/certificates, and we offer exceptional regulatory support.
Does QSA Global, Inc. offer help with custom bull plugs or pressure vessels?
Yes. We provide recommendations on superior materials that are better suited for high temperature, high pressure, corrosive environments and can provide technical guidance on capsule dimensions, interface, assembly, and specific handling features based on your requirements.
What container options are available for sealed source transport?
QSA Global, Inc. uses Type A source transport containers to ship your sealed sources to your desired destination. There are two options for using our transport containers.
1. You can return the transport container to us after we ship your Cs-137 sources to you.
2. You may purchase the container for continual use.
QSA Global, Inc. also offers rugged field transport containers when you need your Cs-137 sealed sources close to your job site, such as with wireline applications. Field transport containers are available for purchase only.
What happens if a Cs-137 sealed radioactive source is lost downhole?
QSA Global, Inc. manufactures insoluble Cs-137 fused glass sources to ensure environmental safety.
Can you help me dispose of Cs-137 Sources?
Yes. QSA Global, Inc. offers disposition services for Cs-137 sources that are no longer required.

Explore More About Sealed Sources

Perpetual Atomics Ltd, QSA Europe, QSA Global and Reef Origin to Collaborate on Building Radioisotope Power Systems in Europe

LEICESTER, England & DOBŘANY, Czech Republic & BOSTON & LONDON--(BUSINESSWIRE)-- Perpetual Atomics Ltd, QSA Europe (a trading ...

Read Article
QSA Global and Perpetual Atomics Partner for Americium Fuel Pellets

Perpetual Atomics Ltd, based in the UK, and QSA Global, Inc., based in the USA, have solved a key challenge in space nuclear power: turning ...

Read Article
QSA Global and Perpetual Atomics Partner for Americium Sealed Sources

Perpetual Atomics Ltd has signed a collaboration agreement with QSA Global, Inc., based in the USA, to process americium into sealed sources for ...

Read Article
QSA Global and DOE Partner to Ensure Stable, Domestic Ir-192 Supply

The U.S. Department of Energy (DOE) Isotope Program and QSA Global, Inc. have ...

Read Article
7 Questions to Ask Before Buying Ir-192

Buying Iridium-192 (Ir-192) sealed sources for your gamma radiography source projector is ...

Read Article

Ready to Order Sources?

Our multi-disciplined technical experts are here to help you find and design the right Cs-137 sealed radioactive sources to achieve fast, precise measurements in your Wireline and Measurement While Drilling (MWD or LWD) applications.

Disposition Services.

Radioactive Cs-137 sources that are no longer required must be transferred to a licensed recipient for final disposition. QSA Global, Inc. can provide all the services needed for the disposition of your sealed Cs-137 sources.