Trade.Information

Product Name: LOW ENERGY XRAYS mammography air scatter skyshine video terminal

Product Description

System: Ultra low energy thin window (7 mg cm2 ) X ray measuring Electret Ion Chamber for measuring mammography X rays, medical X rays, Sky shine or air scatter X rays and video terminal emitted X rays 
Lab/Field: Field (In situ measurement ) 
Radiation detected : X rays from 5 KeV and above. Near flat tissue equivalent response from 5 KeV to 660 KeV. Usable in field for measuring skyshine or air scatter X rays. Usable in laboratories and hospitals for characterizing down to very low energ y X rays. 

Introduction 

Near flat and tissue equivalent responding X ray monitors down to 5 KeV are not easy to find, or if found (such as those with thin Be window), these are very expensive. Thin window electret ion chambers meet this requirement. 

Operation 

This system is a passive integrating detector system. It consists of a charged Teflon disk(electret), open faced ionization chamber, and electret voltage reader and data logger. When the electret is screwed into the chamber, a static electrostatic field i s established and a passive ionization chamber is formed. When X rays (ionizing radiation) enters the sensitive volume, the ions are produced in the air, the ions are attracted to the charged surface of the electret, and the electret charge originally pr esent gets reduced. The electret charge is measured before and after the exposure with a portable electret voltage reader, and the rate of change of the charge ( change divided by the time of exposure) is proportional to the radiation level. 
Electret ion chambers(electret +chamber) are inexpensive, simple, passive with no moving parts or electronic components, unaffected by ambient environmental conditions and can be normally used for several measurements before a need for replacement of the electret. 
Specificity/Sensitivity 

This method is a gross X ray radiation measurement. These provide near energy independent tissue equivalent response for X rays of 5 KeV to 660 KeV. Lower limit of detection depends upon the the volume of the chamber used. This is 1 mR, 5 mR and 3 0 mR respectively for 960 ml, 140, and 10 ml chambers. 
Cost 
Cost of Equipment: $ 2000 to $ 5000 
Consumable cost of detector per measurement: Under $ 1

Company Details

Rad Elec Inc (REI) was incorporated in 1987 to manufacture and commercialize a product researched and developed under a research contract with NYSERDA (New York Energy Research and Development Authority) during 1986 -1987. The product was based on... more