Dual glass sensor in a mixed gamma and neutron radiation field

Sanjoy Mukhopadhyay; Eric Schmidthuber; Khy Senh

doi:10.1117/12.559589

26 October 2004 Dual glass sensor in a mixed gamma and neutron radiation field

Sanjoy Mukhopadhyay, Eric Schmidthuber, Khy Senh

Proceedings Volume 5541, Penetrating Radiation Systems and Applications VI; (2004) https://doi.org/10.1117/12.559589
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Cerium-activated lithium glass with highly enriched ⁶Li dopant is very useful in detecting low-energy neutrons. The neutrons are identified by pulse height separation; however, in a mixed gamma and neutron field a simple pulse height separation severely degrades the gamma rejection ratio for the sensor. By using a glass element doped with natural ⁷Li that is exactly the same as the cerium-activated glass, the ambient gamma response can be obtained. ⁷Li does not show any thermal neutron response. Therefore, the pulse height spectrum due to net neutrons can be obtained by subtracting the pulse height response of the ⁷Li-doped glass from that obtained from a ⁶Li-doped glass element. The pulse height peaks at 1.3 MeV (electron equivalent) with a full width half maximum (FWHM) resolution of 15.5%. A prototype dual counter for gamma and neutron radiation has been built and operationally tested to be linear in the dose rate range of 0 to 1 mrem/hr. A simple conversion formula relating gamma or neutron counts to the corresponding dose rates contains non-significant second-order correction terms. For small hand-held detectors, GS-20 and GS-30 combination glass scintillators have performed well by increasing the effective gamma rejection ratio from neutron counting while increasing the gamma sensitivity (by addition of counts from two similar scintillators).

Citation Download Citation

Sanjoy Mukhopadhyay, Eric Schmidthuber, and Khy Senh "Dual glass sensor in a mixed gamma and neutron radiation field", Proc. SPIE 5541, Penetrating Radiation Systems and Applications VI, (26 October 2004); https://doi.org/10.1117/12.559589

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available