High-Performance, Low-Background Shields and
Accessories for Germanium (HPGe) Detectors

HPLBS1 Shield
The bottom port on the shield includes two nested inserts that allow multiple fit options to the bottom port. The bottom through-hole is 3.5-inches. This can be increased to a 5-inch through-hole by removing the center insert. A second insert makes up almost the entire bottom of the lead shield providing a 9-inch through-hole when removed. The model LFT1 and can be used to remove the larger bottom insert from the shield should this be required. The LFT1 is not included with the HPLBS1; it must be ordered separately.

It is not expect to remove this larger insert; however, it is provided for possible changes that may be required for the customers’ specifications. This 42-lb. insert can be removed and machined locally or shipped back to ORTEC for replacement and/or modification if needed without having the entire shield machined on-site or replaced.

The cutaway sketch shows the two nested ports that are now supplied with the model HPLBS1.

The HPLBS1 shield is designed to accommodate ORTEC cryostat “vertical dipstick” models CFG-PV-1 and CFG-SV or the X-COOLER II.

Close fitting plugs for the 3.5-inch through hole may be ordered as an option with the HPLBS1. Two standard models are available, PLG1 and PLG2.

PLG1 fits inside the 3.5-inch bottom port and closely around a vertical “dipstick” cryostat.

PLG2 is a split plug that fits inside the 3.5-inch bottom port and closely around the X-COOLER cold head. The X-COOLER systems require a split plug in order to fit between the larger capsule and cold head diameter. The two piece design allows the larger detector capsule to be positioned inside the shield and the PLG2 installed around the X-COOLER cold head.

HPLBS1F Front-Loading Shield
The HPLBS1F Shield is similar to the HPLBS1 Shield function, material, and appearance with the additional benefit of a hinged front door to allow easy access to the sample chamber. The bottom through-hole is 3.5-inches and can accommodate the PLG1 and PLG2. It does not include the nested inserts for larger through-hole sizes.

Detailed Technical Specifications (Models HPLBS1 and HPLBS1F)
(drawing)

SHIELDED CAVITY DIMENSIONS 28-cm i.d. X 40-cm high (11-in. i.d. X 16-in. high).

SHIELDING SPECIFICATIONS
9.5 mm (3/8 in.) low-carbon steel casing
101 mm (4 in.) certified Doe Run lead
0.5 mm (0.02 in.) tin sheet liner
1.6 mm (0.064 in.) soft-copper sheet liner

WEIGHT  Total Assembled 1,134 kg (2,500 lb). Shipping 1,270 kg (2,800 lb).

HPLBS2F 
The HPLBS2F Shield is similar to the HPLBS1F, in that it combines front loading with the split-top shield. It differs, however, in that it is designed for use with an ORTEC "J" Type cryostat Model CFG-SJ or CFG-PJ. A compact design results in the need for only 2-ft X 4-ft floor space [61-cm X 117-cm], plus clearance for opening of lids and the front door.

Detailed Technical Specifications in addition to those listed above (Model HPLBS2)         (drawing)

SHIELDED CAVITY DIMENSIONS 28-cm i.d. X 40-cm high (11-in. i.d. X 16-in. high).

SHIELDING SPECIFICATIONS
9.5 mm (3/8 in.) low-carbon steel casing
101 mm (4 in.) certified Doe Run lead
0.5 mm (0.02 in.) tin sheet liner
1.6 mm (0.064 in.) soft-copper sheet liner

DETECTOR ACCESS SLOT WIDTH 4.5 cm (1-3/4 in.).

EXTERNAL DIMENSIONS
Shield 51-cm diam X 63-cm high (20-in. diameter X 24-5/8-in. high).
Stand 61 cm X 117 cm X 77-cm high (minimum) [24 in. X 46 in. X 12-in. high (minimum)].
Assembled Height 94 cm (minimum) to 109 cm (maximum) [37 in. (minimum) to 43 in. (maximum)].

Ordering Information