Seeds in Mick® Cartridge

Cesium-131 seeds are loaded into Mick cartridges and can be used in conjunction with a Mick Applicator, ideal when individual seed placement is desired.


Good for Prostate and Surgical applications

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


  • Organized magazine of seeds for fast placement.
  • Works with multiple delivery systems.


Each Mick cartridge is supplied sterile and and can contain up to 20 seeds per magazine but are shipped standard with 15.

Perspective Therapeutics Difference

  • Expert Sales and Support teams ensuring real-time ordering and delivery for procedures throughout the body.
  • Committed to offering interactive training programs throughout the US teaching the leading techniques and the newest tools.
  • Empowering patients to make their own treatment decisions based on decades of data.

Cesium-131 Treatment Areas

Cesium-131 Products

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Your Isotope Choice Makes a Difference

Not all brachytherapy radioisotopes are the same. Compared to alternative brachytherapy seeds, Cesium-131 offers the highest energy and shortest half-life.


Introduced 2004

17 Day Half Life (18)

20.8 Kev

58 Days for 90% Dose

Detectable in the body for 170 Days


Introduced 2004

9.7 Day Half-Life

The amount of time for the radiation to half. A shorter half life means quicker to PSA baseline. (8, 12, 13)

30.4 Kev

The energy level of the isotope. Higher energy leads to greater coverage of the infected organ.

33 Days for 90% Dose

Faster dose delivery rate.

Detectable in the body
for 97 Days


Introduced 1965

60 Day Half Life (18)

28.5 Kev

204 Days for 90% Dose

Detectable in the body for 600 Days

Armpilla C, Dale R, Coles I, et al. The determination of radiobiologically optimized half-lives for radionuclides used in permanent brachytherapy implants. Int J Rad Onc Biol Phys 2003; 55:378-385.

For my patients, I use Cesium-131 instead of Iodine because most of the effective isotope life is spent in 4-5 wks, compared to the 60-day half-life of Iodine,” he said. “Iodine will still be putting out a pretty good dose of radiation 8 or 9 months later. My patients have a shorter duration of acute uropathic complaints because of that.
Dr. Bradley Prestidge, Radiation Oncologist
Dr. Bradley Prestidge
Radiation Oncologist

Find a Doctor Near You

A diagnosis is just the first step toward treating your cancer. We are here to help you make an informed treatment decision with your doctor so you can begin living your life again.  Use the search (below) to find a Doctor that specializes in Brachytherapy.

Want to know more about the versatility of Cesium-131

Do you have questions? We can help with any issues you may have


  1. Frank SJ, et al. American College of Radiology Appropriateness Criteria: Permanent Source Brachytherapy for Prostate Cancer. Brachytherapy. 2011;10(5):357–362
  2. Cesium-131 Instructions for Use
  1. Cesium-131 brachytherapy seeds are indicated for the treatment of malignant disease (e.g., head and neck, eye, brain, breast, prostate, etc.) and may be used in surface, interstitial, and intracavitary applications for tumors with known radiosensitivity. The seeds may be used as a primary treatment or in conjunction with other treatment modalities, such as external beam radiation therapy, chemotherapy or as treatment for residual disease after excision of primary tumors. Contraindications: As with other brachytherapy sources, treatment of tumors in generally poor condition (e.g., ulcerated) is not recommended with Cesium-131 brachytherapy seeds due to the potential for source migration. Prior to use, please reference the Cesium-131 Instructions for more information on indications, contraindications, warnings, all precautions, and adverse events.

    Caution: Federal law restricts this device to sale by or on the order of a physician.

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