Louis Hempelmann

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Louis Hempelmann
St. Louis, Missouri
OccupationPhysician
Known forManhattan Project

Louis Henry Hempelmann Jr, (March 5, 1914 – June 21, 1993) was an American physician who was the director of the Health Group at the

fluoroscopes
to measure the size of children's feet.

Early life

Louis Henry Hempelmann Jr. was born in

Peter Bent Brigham Hospital in Boston.[2][4]

In 1941, Sherwood Moore, the director of

Robert Oppenheimer.[1]

When he returned to the Mallinckrodt Institute, the cyclotron had been completed, but was being used to manufacture plutonium, so instead Hempelmann established a radioactive phosphorus clinic along the lines of Lawrence's one in Berkeley.[2][4]

Manhattan Project

In early 1943, Hempelmann was summoned to a meeting in

Medical Corps, but Hempelmann remained a civilian.[5] As the head of the A-6 Health Group,[7] he was responsible for occupational health and safety. The Health Group set safe levels of exposure to hazardous chemicals and radioactive substances, and disseminated information about them. It also kept records of hazards to which individuals had been exposed; Records of ordinary injuries were kept by the Post Hospital.[8]

Elinor Hempelmann's Los Alamos badge

On June 5, 1943, Hempelmann married Elinor Pulitzer. She was a granddaughter of the newspaper publisher

Kitty Oppenheimer worked for Hempelmann as a laboratory technician, conducting blood tests to assess the danger of radiation.[10][11]

The first year at Los Alamos was uneventful for the Health Group, which researched the extent of variation in blood counts. The range of variation was found to be higher than expected. This might have resulted in misdiagnosis of overexposure. Serious health issues began to occur in 1944, with the arrival of the first samples of plutonium. Plutonium is similar to

kidneys. Hempelmann visited a Boston luminous paint company to see how it was handled in industry. When he returned he established three special committees in the Chemistry and Metallurgy Division: one to procure instrumentation to measure radioactive contamination; one to design equipment for handling plutonium; and one to develop standards and procedures for its safe handling.[8]

An accident occurred on August 1, 1944, when chemist

stomach pump to retrieve plutonium that had been swallowed, recovering about 60 nanograms. Urine assays indicated that less than 1 microgram remained in his body. Some was still detectable thirty years later.[12][13]

RaLa experiments

The accident brought to a head dissatisfaction in both the Health Group and the Chemistry and Metallurgy Division with the progress of research into biological aspects of plutonium.[8] A committee was established consisting of Hempelmann, Joseph W. Kennedy and Arthur Wahl to develop tests for overexposure to plutonium. At the time the main means of testing was by taking swabs from the nostrils. A better assay test was devised in January 1945 that could detect plutonium in urine in quantities as low as 10−10 micrograms per liter. The test came into general use in April 1945, just in time for the arrival of larger quantities of plutonium produced at the Hanford Site. Because it was time-consuming, reliance was still placed on nose tests, those that registered as most exposed being singled out for urine tests. These indicated that four persons had more than the microgram of plutonium considered safe.[14]

Plutonium was not the only radioactive hazard. There was also polonium, although it never became a serious problem. In 1944 three more dangers appeared: the water boiler aqueous homogeneous reactor, which occasionally sprang a leak and emitted radioactive gases; the RaLa Experiments, which used quantities of highly radioactive materials; and critical assembly experiments, which were particularly dangerous because they seemed so safe that they engendered a sense of complacency in the experimenters.[14] These experiments resulted in two fatal accidents, causing the deaths of physicists Harry Daghlian in August 1945 and Louis Slotin in May 1946.[15] Hempelmann later published a detailed account of these accidents in the Annals of Internal Medicine.[16][17] Hempelmann and his collaborator George L. Voelz continued to study the 27 survivors of these accidents. None showed any signs of radiogenic disease until 1990, when one developed osteosarcoma.[16][18]

Hempelmann was involved in the planning of the

Trinity nuclear test in July 1945, and handled the safety planning for the 100-ton test that preceded it. He delegated responsibility for the main test to Nolan, but had to take over when Nolan was called away to help transport components of the Little Boy bomb to Tinian. In 1946 Hempelmann assisted with the Operation Crossroads nuclear tests in the Pacific.[1]

Post-war

Hempelmann left Los Alamos in 1948, and went to

New England Journal of Medicine warning of the dangers of using fluoroscopes to measure the size of children's feet, a common practice at the time.[16] The fluoroscopes soon disappeared from shoe stores.[16][19] He joined the medical faculty of the University of Rochester in 1950 as an associate professor of Experimental radiology. He came into conflict with the chairman of the Radiology Department over the use of fluoroscopy on infants. At the time, when X-rays were conducted on infants, high-dose fluoroscopy was carried out routinely, as this provided better information on squirming babies. Pediatricians began writing "film only, no fluoroscopy" on X-ray requests. The procedures were changed after it was revealed that a 3-pound (1.4 kg) infant had received seven fluoroscopies and 75 röntgens to the thymus. Hempelmann then embarked on a series of studies of children who had been given radiation therapy for thymus enlargement. At the time such long-term studies were very unusual.[16]

In 1952, Hempelmann published a collaborative review of thirty people who had been treated with radium as part of medical treatment, or had ingested radium as

Jefferson Medical College who wanted to study the effects of radiation on the human body was referred to Hempelmann, who suggested a study of women who had received X-ray treatment for acute postpartum mastitis between ten and twenty-five years before. The study examined 606 women, of whom 13 had developed breast cancer compared with the expected number of 6. The student, Fred A. Mettler, subsequently became the chairman of the Department of Radiology at the University of New Mexico, and an authority on the effects of radiation.[16]

The Hempelmanns divided their time between Rochester and a property they purchased in

Oppenheimer security hearing.[20]
Hempelmann died on June 21, 1993, at Strong Memorial Hospital in Rochester, New York, from complications following a stroke.[3] His remains were cremated and interred in Bellefontaine Cemetery in St. Louis.[9]

Notes

  1. ^ a b c "Louis H. Hempelmann". Atomic Heritage Foundation. Retrieved August 13, 2021.
  2. ^ a b c d Miller & Koszalka 1993, p. 435.
  3. ^ a b c "L.H. Hempelmann, 79; Led Los Alamos Study". The New York Times. July 1, 1993. Retrieved August 13, 2021.
  4. ^ a b c d e f g Hempelmann, Louis Henry (August 10, 1983). "Louis Hempelmann Interview – Part 1" (Interview). Interviewed by Martin J. Sherwin. Rochester: Manhattan Project Voices. Retrieved August 13, 2021.
  5. ^ a b c Hacker 1987, pp. 59–60.
  6. ^ Hempelmann, Louis Henry (August 10, 1983). "Louis Hempelmann Interview – Part 4" (Interview). Interviewed by Martin J. Sherwin. Rochester: Manhattan Project Voices. Retrieved August 13, 2021.
  7. ^ Hawkins 1961, p. 36.
  8. ^ a b c Hawkins 1961, pp. 59–62.
  9. ^ a b c d "Obituary of Elinor Hempelmann: Granddaughter of Joseph Pulitzer, wife of atomic bomb scientist". St. Louis Public Radio. September 5, 2012. Retrieved August 13, 2021.
  10. ^ Streshinsky & Klaus 2013, p. 51.
  11. ^ Hempelmann, Louis Henry (August 10, 1983). "Louis Hempelmann Interview – Part 3" (Interview). Interviewed by Martin J. Sherwin. Rochester: Manhattan Project Voices. Retrieved August 13, 2021.
  12. ^ Welsome 1999, pp. 15–19.
  13. ^ Moss & Eckhard 1995, p. 190.
  14. ^ a b Hawkins 1961, pp. 183–186.
  15. ^ Hacker 1987, p. 73.
  16. ^ a b c d e f Miller & Koszalka 1993, p. 436.
  17. ^ Hempelmann, Lisco & Hoffman 1952, p. 279.
  18. ^ Voelz & Lawrence 1991, pp. 181–190.
  19. ^ Hempelmann 1949, pp. 335–336.
  20. ^ a b Hempelmann, Louis Henry (August 10, 1983). "Louis Hempelmann Interview – Part 2" (Interview). Interviewed by Martin J. Sherwin. Rochester: Manhattan Project Voices. Retrieved August 13, 2021.

References

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