Isoray - Innovative Brachytherapy
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Cesium Blu - Cs-131

Cesium 131 is a proven, minimally invasive treatment designed to treat a variety of cancers with precision.

A diagnosis is the first step towards treating your cancer.
With the many advances and options in cancer treatment, determining what is right for you can feel overwhelming.

Isoray is here to help.

We’re committed to providing a powerful, proven treatment while connecting you with the very best care teams available.

Isoray - Proven, Personalized, Precise

Patients & Families

Find a Doctor Near You

A diagnosis is just the first step toward treating your cancer. We are here to help you make an informedtreatment decision with your doctor so you can begin living your life again.

Don't let cancer slow you down!
Couple enjoying life!
Time with family and grandchildren is precious!

Years of Data

Patients Treated

Day Half Life

Targets Cancer

Treats cancer at the source

High Energy

Higher energy, greater coverage

Short Half-Life

Shorter half-life for rapid resolution of side-effects

Quick recovery time for most patients

Speed of Delivery

Isoray with Cesium-131 can treat Prostate, Head and Neck, Lung, Brain and Gynecological cancers

“Cesium-131 provides everything we want for prostate brachytherapy as both a monotherapy and in combination therapy, including delivery of a high dose of radiation more quickly for high risk patients in a low dose rate ‘setting.’”

Dr. Bernard W. Taylor

Texas Oncology - Longview Cancer Center

Cesium Blu (Cs-131) & Sirius MRI Marker
Unlock the full benefits of MRI-based treatment planning and post-implant quality assurance with Cesium Blu (Cs-131). Now FDA-cleared for pairing with the Sirius® MRI Marker.
MRI scanner

About Us

Isoray develops innovative, personalized brachytherapy products that effectively treat many forms of cancer.

Blog

It’s the Details That Make Cesium-131 The Better Choice

It’s the Details That Make Cesium-131 The Better Choice

By Peter T. Heiberger, M.S. DABR, RSOLead Medical Physicist, Radiation Oncology, Aurora Health Care, Green Bay, WI When I think about Cesium-131 an old expression comes to mind. “It's the little details that are vital. Little things make big things...

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Whether you’re a Patient or a Clinician,
we’re here to help.

Call us at 1-509-375-5329