Gradient

Radiation

Overview
Example Projects
Experts

Overview

With nearly 30 years of risk assessment experience, Gradient scientists bring sound science to the health risks and potential environmental impacts of both radiation and chemical exposures. Whether in the context of litigation, supporting environmentally sound site closure, or addressing public concerns, Gradient uses human health risk assessment to assess radioisotope concentrations in environmental media and evaluate the potential for cancer or other health risks. We place these risks in proper perspective compared to background radiation as an important element of risk communication. Moreover, Gradient scientists help draw the important health-risk distinctions between exposure to ionizing versus non-ionizing radiation (e.g., power-line electric and magnetic fields, cell phones, and radio waves).

Example Publications:

Goodman, JE; Nascarella, MA; Valberg, PA. 2009. "Ionizing radiation: A risk factor for mesothelioma." Cancer Causes Control 20:1237-1254.

Valberg, PA; Van Deventer, TE; Repacholi, MH. 2007. "Base stations and wireless networks: Radiofrequency (RF) exposures and health consequences." Environ. Health Perspect. 115:416-424.

Power Transmission Lines Abstract

Example Projects

Cumulative Chemical and Radionuclide Risk Assessment for a Power Plant Decommissioning

Full Description

Gradient evaluated the cumulative risks posed by residual chemicals, including radionuclides, present at a former nuclear power plant. We modeled chemical and radionuclide uptake within the local ecosystem and evaluated human exposure scenarios.

Risk Assessment for Uranium/Thorium and Decay Products at a Site in FUSRAP

Full Description

Gradient performed a health risk assessment for workers at and visitors to a manufacturing facility contaminated by uranium ore. We provided risk estimates based on both cumulative radiation dose and lifetime cancer risk, which ultimately formed the basis of a plan for reuse.

Groundwater Radium Exposures and Osteosarcoma Risk

Full Description

Gradient evaluated the distribution of radium in groundwater relative to regional background levels while estimating the possible historical radium exposure from consumption of public drinking water, recreational exposures in surface water, and vegetable intake. We conducted epidemiological analyses to determine whether radium released from a superphosphate fertilizer plant could cause osteosarcoma.

Ionizing Radiation Exposure and Leukemia Risk

Full Description

Gradient conducted a review of the scientific literature to determine the evidence for a causal relationship between radiation exposure and risk of acute myelogenous leukemia. We evaluated whether an individual's claim that his exposure to ionizing radiation during his employment as a chiropractor was related to his development of this disease.

Radium Health Risk Assessment at a Former Factory

Full Description

Gradient conducted a human health risk assessment to evaluate the need for medical monitoring for construction workers potentially exposed to radium (Ra-226) during a short-term renovation project located within a former factory where luminescent dial painting had occurred. We developed Ra-226 exposure estimates based on interviews with site management and measurements taken during an extensive radiological assessment of the site.

Experts

Teresa S. Bowers Read Bio

Tom A. Lewandowski Read Bio

Christopher M. Long Read Bio

David E. Merrill Read Bio

Peter A. Valberg Read Bio