USA flag logo/image

An Official Website of the United States Government

Pulse Pileup Recovery for Energy Dispersive Spectroscopy

Award Information

Department of Health and Human Services
Award ID:
Program Year/Program:
1997 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
4pi Analysis, Inc.
3500 Westgate Dr., Suite 403 Durham, NC 27707
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 2
Fiscal Year: 1997
Title: Pulse Pileup Recovery for Energy Dispersive Spectroscopy
Agency: HHS
Contract: N/A
Award Amount: $404,257.00


Quantitative energy dispersive spectroscopy (EDS) x-ray microanalysis provides important information regarding the distribution of elements within a biological sample. The low elemental concentrations in biological specimens require dwell times of several seconds livetime to obtain spectra with significant statistical information, especially for quantitative EDS imaging. Deadtime caused by the rejection of pulse pileup counts is a major limiting factor of x-ray collection during the acquisition of x-ray spectra. The dwell time can be reduced by 25% or more (depending upon beam current conditions) by recovering rejected pulse pileup counts. This significant reduction in deadtime would increase efficiency (both in cost and time) for the collection of quantitative x- ray data and images from biological samples; such improved instrumentation is not currently available. In Phase I, the real-time recovery of pulse pileup counts will be examined using current analog/digital electronics and a digital signal processor to establish the most effective (cost and performance) method. The Phase II goals will be the low cost realization of a new form of pulse pileup-free microanalyzer based on the Phase I results and its application to quantitative x-ray imaging and data acquisition of biological samples.

Principal Investigator:

Scott D. Davilla

Business Contact:

Small Business Information at Submission:

4pi Analysis, Inc.
3500 Westgate Drive, Suite 403 Durham, NC 27707

Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No