U.S. Radium, Then and Now
May 14, 2012Many people know the tragic story of the “radium girls,” the luminous-dial painters of the flapper era who tipped their paintbrushes in their mouths, became sickened from internal radiation exposure, and had to fight for workers’ compensation as they died. Although a large number of radium paint factories existed, one in particular is identified with this infamous episode: the United States Radium Corporation, sited on two acres at the southwest corner of High and Alden Streets in Orange, New Jersey. This factory was built in 1917 for the combined purposes of radium extraction, purification, and paint application. Two original buildings—including the paint application building—remained standing until the US EPA had them torn down as part of a Superfund remediation project in 1998. Today, the site is a barren, fenced-in, field with no hint of radioactivity betraying its former capacity. In this post I’ll share a few photos from my trip this month, from the Library of Congress’s archive of the recent past, and even one from the plant’s heyday. I’ll share some quotes about the technical operation of this facility, and a pic of my samples of its product, Undark.
______________________________
Paint Application Building, exterior: About 300 dial painters, virtually all of them young women, came to work here between the years of 1917 and 1926.
……..
……..
______________________________
Paint Application Building, interior: “Dial painting areas had four parallel rows of work benches, aligned with the building’s longer axis. Both floors included large wooden, double-hung, triple windows, and at least one section of the upper floor appears to have skylights.”
______________________________
Crystallization Laboratory: From the element’s discovery well into the 1950s, the only practical chemical technique for separating radium from barium was arduous multi-stage fractional crystallization. U.S. Radium used a chloride and bromide system, as described by Florence Wall, plant chemist: “…in the crystallization laboratory, large quantities of radium chloride solution from the plant progressed in stages from silica tubs, three feet in diameter and about a foot deep, into smaller evaporating dishes until, after conversion, the product appeared as a few crystals of radium bromide in a tiny dish, 1/2 inch in diameter.”
……..
______________________________
The Product: U.S. Radium named its radioluminous paint Undark. An article that was painted with this product was said to be “Undarked.” The formula of Undark varied with application and was a trade secret. At the time of the “Radium Girls” poisoning, a single employee named Isabel manufactured a zinc sulfide base activated with trace quantities of cadmium, copper, and manganese. Another employee, originally company founder S. A. von Sochocky, added a measured amount of radium to the base and fixed it in its insoluble sulfate form: “[D]epending upon the type of work the material is to be used for the element of radium varied from one part of radium element to 140,000 parts of the base—zinc sulphide, to one part of radium element to 53,000 parts of the base [about 20 microcuries per gram]. The radium element when added to the zinc sulphide […] is in an aqua solution. When that is added to the zinc sulfide which is in the form of a dry powder, it becomes like a paste. The radium element when mixed with the sulphide powder is soluble. In order to make certain that it will become insoluble and also that it will be equally distributed in the paste and also to prevent the radium element from being dissolved later when water is applied to it, I converted the radium into radium sulphate which is insoluble by adding amount of ammonium sulphate also in an aqua solution.”
______________________________
The Waste: Anything that was not radium—i.e. the vast majority of the ore that entered the plant—was waste and had to find a new home! This included the uranium content of the ore; preceding the discovery of fission, uranium was effectively worthless. One common application for U.S. Radium tailings was infill for construction projects in nearby Glen Ridge, Montclair, and Orange. Contaminated fill was identified, dug up, and replaced throughout the 1990s.
______________________________
References:
Historic American Engineering Record HAER NJ-121, National Park Service (1996) (All quotations in italics above are from this source.)
Photographs from above record by Thomas R. Flagg, Gerald Weinstein, 1995-1996, at the U.S. Library of Congress
Great blog) Keep posting
by Kiril May 18, 2012 at 11:21 pmNice article Carl. I remember growing up with those watches with the hands of a watch glowing so you could see them at night. I also remember purchasing some paint that when painted on something it would glow in the night. Perhaps radium?
by Steve Zuck May 20, 2012 at 6:21 amFrom what I can recall they used a very small amount of radium, and mixed it in with phosphorus. The radium would stimulate the phosphorus to glow in the dark, much like exposure to bright light would, as will high voltage. Luminescent paint is still very much on the market, I don’t know if it still contains green phosphorus or not, but I doubt whether any such commercially available paint purchased from a store, since the late 1930s, would have contained actual radium. I used to be concerned about the glow in the dark dials, and hands found on vintage clock radios, but that was before I found out about how little radium the paint actually contained, and the fact that it transmutes, and breaks down over time.
by Fritz March 5, 2019 at 1:10 amFor the record, the most common isotope of Radium, Ra-226, has a half-life of 1600 years, meaning of course that if you had a gram of Ra-226, half of it would have decayed after 1600 years. Radium dials become dark because the intense radiation destroys the phosphors in the paint; the radioactivity remains a long long time.
by Jenna October 29, 2020 at 6:03 pmI guess I will have to borrow a Geiger counter and find out how hot these dials still are. Given the cost of radium at the time I doubt whether they would have used anything close to a gram in the paint. Point in fact these dials still glow, but only if they are exposed to bright artificial light, or sunlight for hours at a time.
by Fritz December 11, 2020 at 7:39 pmCarl;
by Jack Aubrey June 2, 2012 at 6:37 pmCan you give your readers a CPM reading of one of the vials with a common G-M tube like the Ludlum 44-9 or a 1×1 NaI scintillator?
That would be helpful for those of us that have a WWII helmet marker, to estimate the microcuries in the markers.
Thanks!
Hi Jack, the 44-9 is a pancake tube mostly sensitive to beta particles, and since betas are strongly attenuated in the source and its packaging, this wouldn’t be too meaningful a measurement unless both sources had very similar packaging. An NaI scintillator is gamma-sensitive, but the count rate depends critically on the detector’s threshold and the gain of the specific PMT at a specific operating voltage, and thus this isn’t a good comparison either. One of my vials measures 750 cpm on an energy-compensated HP-270 probe at 10″, corresponding to 0.63 milliroentgen / hr there. Using the Ra-226 equilibrium specific gamma constant, this suggests a content of 49 microcuries of Ra-226 in that vial. The Geiger measurement is within 20% of a calibrated Ludlum 9 ion chamber reading, beta window closed and centered on the same location. I still think the reading is high due to betas and bremsstrahlung and believe the vial content is closer to 20 microcuries each. The surest measurement would be a calibrated HPGe reading of a Bi-209 peak at a carefully-controlled distance, but that’s more involved than I was able to go tonight. Hope this helps some.
by carlwillis June 2, 2012 at 9:13 pmHow did you you obtain a specific license to possess the unused Undark? The Energy Policy Act of 2005 made radium-226 in most forms a much more stringently regulated material, and it is retroactive. In fact it’s now a “byproduct material.”
These sources are well above the “small source activity” for luminous antiquities. A small radium source is defined in
10 CFR 31.12(a)(5) as containing an amount of radioactivity of 0.037 megabecquerels (equivalent to 1.0 microcurie) or less. Sources of this type have been used as operational check sources
for radiation measuring instruments, educational demonstration equipment (e.g., cloud chambers and spinthariscopes), electron tubes, lightning rods, ionization sources, static eliminators, and other approved uses. Such sources may be possessed under a general license; however, if the source strength exceeds 0.037 megabecquerels (1.0 microcurie), a specific license will be required.
31.12 Reads:
(Redacted for length by Carl Willis. We can all find the regulation text online if interested)
by mattmillman76 May 26, 2013 at 7:32 amMy possession of the Undark and other antique radioluminous sources comports with state and federal regulations as I understand them. On another note, I’m not sure why you’re posting entire sections of 10 CFR to my comments…we all know where to find these and an abbreviated citation is entirely sufficient to support whatever point you are trying to make with this stuff.
by carlwillis May 26, 2013 at 7:46 amI grew up a few blocks from here. My mom worked in a sequin factory (Elliot, Greene & Co.) that occupied the crystallization lab building! I had been in here many times as a kid (I’m 58 as of this righting). On the corner to the left of the main paint application building, the small one story building, was a sandwich shop back then. My mom had been examined several times over the years after the Superfund project started. She was fine. I use to play on the train tracks behind these buildings all the time.
by David July 25, 2016 at 8:29 pmExcuse he typos!
by David July 25, 2016 at 8:31 pmHI Carl, my father worked for US Radium and its successor, Safety Light Corp. He was a Chemical Engineer who started working with glass products in Vineland NJ, then formed a company with a friend called Tele-Ray Tube that coated TV picture tubes. After their company went out of business, he started working for US Radium/Safety Light in Bloomsburg, PA and Whippany, NJ. Both sites are former Superfund cleanup locations.
I remember visiting the plant in Bloomsburg once with my father. We entered through the employee entrance on the side of the building and headed toward the kilns. After only about one minute in the building, I ran for the exit because I could not breathe. He brought me in through the main entrance and I could go no farther than his office.
We had a variety of items around our house in NJ from my Dad’s work: glow-in-the-dark aircraft dials, an household air ionizer, and small metal cylinders with glass bulbs on top that contained phosphorescent dust that I was told were used in large highway signs. None of the artifacts survive to this day, and my father passed away in the late 70s. Tests showed he had multiple forms of cancer, not surprisingly.
by Richard Clapham February 15, 2017 at 8:46 amWhat U S Radiumdid was sinful.
by Tom Stessl August 23, 2018 at 10:32 am[…] real company was ‘U.S. Radium,’ and we changed the name slightly. The whole story is a true story and the court case that the […]
by 'Radium Girls,' The True Story Of Poisoned Factory Workers Who Fought Back - Supply Chain Council of European Union | Scceu.org November 11, 2020 at 1:03 pm[…] Willis, Carl. “U.S. Radium, Then and Now.” Special Nuclear Material, 10 Apr. 2017, https://carlwillis.wordpress.com/2012/05/14/u-s-radium-then-and-now/. […]
by Six Million Cubic Feet | Environmental Inequality November 2, 2021 at 9:39 pm[…] 4. Carl Willis, “U.S. Radium, Then and Now” Special Nuclear Material, A Carl Willis Joint, WordPress, May 14, 2012, https://carlwillis.wordpress.com/2012/05/14/u-s-radium-then-and-now/ […]
by E Pluribus Unum | Environmental Inequality January 12, 2022 at 9:35 am