Patent ID: 9024618
Filing Date: 2015-05-05
Classification: G01R

Abstract:
1. An environmental radiation monitor including: a power supply; a high pressure ionization chamber electrically connected to the power supply, wherein the high pressure ionization chamber is configured to produce a current signal; an electrometer electrically connected with the high pressure ionization chamber, wherein the electrometer includes: an electrical amplifier receiving the current signal, wherein the electrical amplifier is configured to convert the current signal to a voltage signal, a compensation circuit electrically connected to the electrical amplifier, wherein the compensation circuit is configured to modify the voltage signal, and a heat producing device, wherein the heat producing device is activatable to induce a temperature increase to the electrical amplifier and the compensation circuit; and a controller operatively connected to the electrometer, including operatively connected to the heat producing device, and including a test function portion for activating the heat producing device to increase the temperature around the electrometer and comparing a value of the voltage signal prior to the temperature increase to a value of the voltage signal subsequent to the temperature increase to determine temperature dependent voltage signal variance.