Navigation Links
Air Force aircraft returned from Vietnam is postwar source of Agent Orange contamination

February 25, 2014 -- From 1971-1982, Air Force reservists, who flew in 34 dioxin-contaminated aircraft used to spray Agent Orange and returned to the U.S. following discontinuation of the herbicide spraying operations in the Vietnam War, were exposed to greater levels of dioxin than previously acknowledged, according to a study published today in Environmental Research by senior author Jeanne Mager Stellman, PhD, professor emerita at the Mailman School of Public Health's Department of Health Policy and Management.

"These findings are important because they describe a previously unrecognized source of exposure to dioxin that has health significance to those who engaged in the transport work using these aircraft," according to Dr. Stellman and Peter A. Lurker, PhD, PE, CIH, an environmental engineer with many years of experience evaluating environmental exposures in the Air Force.

During the Vietnam War, in an operation known as "Operation Ranch Hand," approximately 20 million gallons of herbicides, including around 10.5 million gallons of dioxin-contaminated Agent Orange, were sprayed by 34 C-123 aircraft. These aircraft were subsequently returned to the U.S. and were used by Air Force reserve units between 1971 and 1982 for transport operations. After many years without monitoring, tests revealed the presence of dioxin (also known as TCDD). All but three of the aircraft were smelted down in 2009.

The Air Force and Department of Veterans Affairs have previously denied benefits to these crew members. Current policies stipulate that "non-biologically available dried residues" of chemical herbicides and dioxin would not have led to meaningful exposures to flight crew and maintenance personnel, who are therefore ineligible for Agent Orange-related benefits or medical examinations and treatment.

Researchers estimated dioxin body burden using modeling algorithms developed by the US Army and data derived from surface wipe samples collected from aircraft used in Operation Ranch Hand. They compared estimates with available guidelines and standards and discuss the implications with respect to current Air Force and VA policies.

These models suggest that the potential for dioxin exposure to personnel working in the aircraft post-Vietnam is greater than previously believed and that inhalation, ingestion, and skin absorption were likely to have occurred during post-Vietnam use of the aircraft by aircrew and maintenance staff. The estimated dermal and oral exposure exceeded US standards. The estimated airborne contamination exceeded the only available (German) standard.

Dr. Stellman and her co-authors Drs. Fred Berman, DVM, PhD, director of Toxicology at Oregon Health Sciences University and Richard Clapp, professor emeritus, Boston University School of Public Health had previously consulted with the Senate Veterans Affairs Committee on the unresolved issues of Agent Orange exposures in the aircrew. They teamed up with Dr. Lurker to develop the models to clarify the issue.

"Our findings, the results of three different modeling approaches, contrast with Air Force and VA conclusions and policies," concludes Dr. Stellman. "The VA concept of a "dried residue" that is biologically unavailable is not consistent with widely accepted theories of the behavior of surface residues. Aircraft occupants would have been exposed to airborne dioxin-contaminated dust as well as come into direct skin contact, and our models show that the level of exposure is likely to have exceeded several available exposure guidelines."


Contact: Stephanie Berger
Columbia University's Mailman School of Public Health

Related medicine news :

1. U.S. Task Force Issues Blood Pressure Guidelines
2. Older Women Should Not Take Calcium, Vitamin D: Task Force
3. MDS researchers join forces to advance patient treatments and outcomes
4. Task force recommends new lung cancer screening guidelines
5. US mammograms decline after task force recommendation, Mayo Clinic finds
6. U.S. Mammography Rates Drop Following Task Force Recommendations
7. APA task force recommends treatment guidelines and position statements on transgender persons
8. Test-Med Joins Forces with Mollen to Expand its Service Offerings to its Customers
9. Force of habit: Stress hormones switch off areas of the brain for goal-directed behaviour
10. ASBMR task force urges use of fracture liaision services to reduce costly osteoporosis bone breaks
11. GW School of Nursing receives nearly $1 million grant to diversify nursing workforce
Post Your Comments:
(Date:11/30/2015)... ... November 30, 2015 , ... In an effort to ... to access life-saving information provided directly from top experts in mesothelioma, in 2016 ... conferences in three major cities: Houston, San Francisco, and Chicago. , “For ...
(Date:11/30/2015)... Los Angeles, CA (PRWEB) , ... November 30, 2015 , ... ... hunger cravings that drive people to overeat are not necessarily caused by real hunger, ... brain that the stomach needs food. He notes that, while many patients are aware ...
(Date:11/30/2015)... FL (PRWEB) , ... November 30, 2015 , ... ... a comparison chart and ingredient list of its hemorrhoid ointment to its website. ... effective pain relief for people suffering from hemorrhoids. Adding the comparison chart and ...
(Date:11/30/2015)... ... November 30, 2015 , ... Using a combination of two blood sugar tests ... adults, according to a new study by researchers at the School of Public Health ... Adults: Using Combinations of Blood Glucose Tests ,” published in Frontiers in Public Health, ...
(Date:11/30/2015)... ... November 30, 2015 , ... The recently published 32nd Annual ... (NPDS) reveals that in 2014, someone called a poison center about every 11 ... which were human exposure cases. , The American Association of Poison Control Centers ...
Breaking Medicine News(10 mins):
(Date:11/30/2015)... Medical Systems (NYSE: VAR ) has signed a Memorandum of ... the largest hospital chain in India , to ... country. The MoU was signed by Dr. K. Prabakar , ... Varian,s India managing director, in ... intends to deploy its Access to Care program by leveraging the ...
(Date:11/30/2015)... , Nov. 30, 2015   VolitionRx Limited (NYSE ... diagnostic tests for a broad range of cancer types and ... LD Micro Conference, which will be held December 1 - 3 ... from VolitionRx will be David Kratochvil , Chief Financial ... of Investor Relations. ® blood-based tests for ...
(Date:11/30/2015)... -- Mexico Healthcare and Life Sciences Report 2015 . ... --> Pharmaboardroom releases its new 98-page Mexico Healthcare ... , a country of over 122 million people. --> ... million people. --> It offers companies, investors, policymakers, and ... into the second largest pharma and healthcare market in ...
Breaking Medicine Technology: