SKCCC Experimental Irradiator Core

Overview of Services


  • Maintains and operates sources of ionizing radiation for use by Cancer Center Members in their experimental studies
  • Established in 1986
  • Services include training in the operation of the sources, advice to users on the design of experiments using radiation, scheduling use of the sources, operating the sources when necessary, dosimetry for new experimental setups, and maintenance and repair of the resources.



John Wong, PhD., Resource Director



Marikki Laiho, MD, PhD Co-Director



Elwood Armour, Ph.D., Physicist



Esteban Velarde, Core Manager


Location and hours of operation

Hours Location

Monday- Friday

9AM - 9 PM

Excluding Holidays

Location 1:

1550 Orleans street

Location 2:

1650 Orleans Street

Baltimore, MD

Links and Resources


All unescorted irradiator users will follow the U.S Nuclear Regulatory Commission and Maryland Department of the Environment regulations for use of the experimental irradiators in the Kimmel Cancer Center.

Those individuals requiring immediate use of the irradiators will need to work with someone that already has approved access (escort). It is mandatory that this approved person accompany you during your use of the irradiator. You may work with an approved person while you are applying for your own access.

If your use of the irradiator will be limited (3-4 times), you do not have to go through the approval process, but you will use the irradiator with someone already approved.

If you have been in the US for less than one year, you cannot apply for unescorted access.

Everyone requesting unescorted irradiator access requires a background check and fingerprinting. This process can take up to 60 days.



To begin the approval process:

1.  Email Carl Granlund at with the following information:
Name, email, lab, principal investigator, and start date of employment with Johns Hopkins.


2.  You will be emailed directions for completing an online security check.


3.  You will be notified by email when the next fingerprint session is scheduled (one session per month).

When your background check and your FBI fingerprints/history are completed, you will be notified by email regarding your approval. If you have questions on the approval process please contact Carl Granlund, Radiation Control Unit at (443 28)7-7303.

A dosimeter (radiation monitoring badge) is not needed to enter irradiator rooms or to use irradiators. There is a permanently assigned dosimeter inside each irradiator room

Radiation Badge Monitor Application
(only for x-ray irradiators Small Animal Radiation Research Platform or Xstrahl Biological Irradiator)


Radiation Badge Monitor Application






Name Role Phone Email Location
Esteban Velarde
Core Manager

John Wong
Resource Director

Elwood Armour

Marikki Laiho


Price List

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Administrative Fee (1)