|
Download PDF
Germanium Detector Stocklist
|
How to Choose the Right
Photon Detector The Cryostat
PopTop, the Versatile Cryostat Choice
ORTEC’s proprietary transplantable PopTop capsule (U.S.A.
Patent No. 4,851,684), attached to a companion cryostat and
liquid nitrogen dewar, is the best solution for most
applications. If you do choose PopTop, you will be able, inexpensively, to
select more than one cryostat configuration, either now or
later. If, for example, you decide on a vertical dipstick
cryostat now, but decide later to use the detector both in the
laboratory and in the field, you can obtain a Gamma Gage hand-held
cryostat/dewar that will mate with the capsule. The capsule
can be quickly attached to the Gamma Gage when going into
the field, then re-attached to the vertical cryostat for use
in the laboratory. PopTop LN2 cooled detectors are field
upgradeable to the
X-COOLER
II LN2-Free cooling system.
Non-PopTop and Special Cryostats for
Special Requirements
A non-PopTop cryostat may be the best choice for certain
demanding applications. For example, if ultra-low MDA is
needed for particular lines that may be present in standard
cryostats, the choice is an Extra-Low-Background (XLB) non-
PopTop, "streamline" cryostat, which has been optimized in
every way for this purpose.
Figure 18. View of GAMMASPHERE with right
half removed. |
Non-PopTop cryostats are routinely supplied for all low
background, Well, IGLET, and IGLET-X detectors.
For experiments in which the detector is to be subjected to
intense fast neutron flux, a non PopTop ("streamline")
cryostat is recommended.
ORTEC has produced many special cryostats designed to
meet specific customer requirements. A noteworthy example is
the array of 100 special detectors, of which 60 were
"segmented," in GAMMASPHERE, the largest such
configuration of detectors in the world. Other specials
include detectors used in balloon experiments, detector arrays flown
in helicopters for gamma ray topology measurements, and
internally-shielded detectors for Safeguards and post
accident monitoring purposes. |
