Effects of 33-MeV proton bombardment on the performance of CdTe gamma-ray detectors

Conference · Sun Feb 01 04:00:00 EST 1976 · IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 468-472

OSTI ID:4066985

Nakano, G H; Imhof, W L; Kolner, J R

A measurement program to investigate the performance of CdTe gamma-ray detectors after bombardment with 33-MeV protons has been undertaken in order to evaluate the effects of energetic protons encountered on earth-orbiting satellites. The pulse heights and energy resolutions of the 59.6 keV line from $sup 241$Am and the 122 keV line from $sup 57$Co and the leakage currents of the detectors were monitored as a function of proton fluence. Of the two types of CdTe detectors tested, far greater radiation effects were observed in those obtained from Tyco (chlorine doped) than in the sensor obtained from Hughes (indium doped). In the former detectors the relative pulse heights appeared to decrease slowly with increasing fluence up to about (5-9) x 19$sup 9$ protons/ cm$sup 2$ beyond which the gain degraded at a faster rate. The energy resolution and leakage currents were observed to improve at moderate fluence levels near (1- 3) x 10$sup 9$ protons/cm$sup 2$. In one of the two chlorine doped sensors tested, the intrinsic detector resolution at 59.6 keV improved from 4.3 keV to 2.6 keV at a fluence of 2 x 10$sup 9$ protons/cm$sup 2$ and subsequently degraded beyond its original performance level after 5 x 10$sup 9$ protons/cm$sup 2$. (auth)

• Research Organization: Lockheed Palo Alto Research Lab., Plao Alto, CA
• NSA Number: NSA-33-029439
• OSTI ID: 4066985
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci., v. NS-23, no. 1, pp. 468-472
• Country of Publication: United States
• Language: English

Related Subjects

*CDTE SEMICONDUCTOR DETECTORS-- PHYSICAL RADIATION EFFECTS
440200* --Instrumentation--Radiation Effects on Instrument Components
Instruments
or Electronic Systems
ENERGY RESOLUTION
LEAKAGE CURRENT
MEV RANGE 10-100
N46110 --Instrumentation--Radiation Detection Instruments--General Detectors & Monitors
N46300* --Instrumentation--Radiation Effects on Instrument Components
Instruments
or Electronic Systems
PERFORMANCE
PROTONS
SATELLITES