StemRad

StemRad is an Israeli-American start-up company that develops and manufactures personal protective equipment (PPE) against ionizing radiation. Its first product was the 360 Gamma, a device that protects the user's pelvic bone marrow from gamma radiation. Its second product, AstroRad, is currently being tested at the International Space Station.
History.
StemRad was founded in December 2011 by Oren Milstein and Daniel Levitt. They were inspired to create the company by the Chernobyl disaster where many of the firemen and engineers, who were first on the scene, died from high doses of gamma radiation in an illness known as Acute Radiation Syndrome (ARS), also known as radiation sickness. This idea was fueled by a sense of urgency due to the growing nuclear threat on the state of Israel. Following the Fukushima Daiichi nuclear disaster in March 2011, the two partnered with Roger Kornberg, Aaron Ciechanover and Michael Levitt.
Products.
360 Gamma.
The 360 Gamma is a belt designed to protect the pelvic area against gamma radiation. It is meant to be worn by first responders (fire fighters, paramedics, police and the military), that would be exposed to radiation in the event of a nuclear emergency. It does not attempt to protect the whole body of the wearer, but rather selectively protects the bone marrow-rich pelvic region. It is offered as a solution for acute radiation syndrome (ARS), a major component of which is bone marrow failure.
AstroRad.
AstroRad is personal protective equipment for astronauts to be worn beyond low Earth orbit which was co-developed by StemRad and Lockheed Martin. AstroRad protects bone marrow to prevent acute radiation sickness but is further expanded to also protect the lungs, stomach, colon, breast and ovaries – organs that are particularly sensitive to the development of cancer due to chronic exposure to radiation. In April 2018 it was announced that the Israeli Space Agency signed an agreement with NASA and the German Aerospace Center to test AstroRad aboard an uncrewed flight of NASA's Orion, on a mission named Artemis 1.
As a test before its planned use in deep space, an AstroRad vest launched to the International Space Station in low Earth orbit on November 2, 2019 aboard Cygnus NG-12. The functional shielding material is made of high-density polyethylene or HDPE. Famous entrepreneur and former Israeli Air Force pilot Eytan Stibbe is set to wear the AstroRad during the first commercial spaceflight to the ISS by Axiom Space that is going to take place in early 2022. 
StemRad MD.
Another technology of StemRad is the StemRad MD protective system, an ergonomically efficient protective suit designed for interventional radiologists and other physicians who perform medical imaging using ionizing radiation, most notable fluoroscopy. This technology was designed to increase whole-body protection, particularly to the head, while providing physicians relatively free-range motion capabilities while operating. For ergonomic relief, the StemRad MD system uses a proprietary exoskeleton system that transfers the system's shielding weight to the floor, reducing the possibilities of musculoskeletal strain.
The protective ensemble consists of four main parts: a protective apron, a protective visor, a thyroid collar, and an exoskeletal system. The protective apron is of a state-of-the-art bismuth-antimony bilayer composition and offers 0.5mm lead-equivalent protection with a small overlap area of 1mm in the front. The visor is made up of a transparent lead-acrylic material and is designed to provide full head and eye protection, areas that are many times exposed in users of standard lead aprons. It is positioned at an angle so that it blocks most of the radiation coming from underneath and allows the physician to wear unshielded prescription glasses while performing procedures. The thyroid collar is unique in the sense that it is integrated into the protective apron component and is flush with the bottom side of the protective visor.