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Model

НР-280

Neutron

Sphere

A.

GENERAL

DESCRIPTION

The

Model

HP-280

is

a

three-inch-diameter

cadmium-

covered

polyethylene

sphere

which

uses

the

same

BF,

tube

as

the

NRD

nine-inch

sphere.

HP-280

readings

are

to

be

taken

with

the

same

tube

as

the

NRD.

No

tube

is

supplied

with

the

HP-280.

The

cadmium

covering

over

the

HP-280

will

cause

the

detector

to

reject

thermal

neutrons.

Because

of

the

smaller

moderating

volume

of

polyethylene

of

the

HP-280,

it

will

overrespond

to

lower

energy

neutrons

and

underrespond

to

higher

energy

neutrons

as

com-

pared

to

the

nine-inch

sphere.

Thus,

in

the

energy

range

in

which

the

HP-280

responds,

a

ratio

of

reading

bet-

ween

the

nine-inch

and

three-inch

spheres

will

give

in-

formation

as

to

the

energy

spectrum

of

the

neutron

flux.

This

energy

information

has

been

correlated

to

the

energy

dependence

of

the

albedo

neutron

TLD

dosimeter

(see

references

1

and

2

below).

This

energy

correlation

is

shown

as

a

calibration

factor

which

would

be

applied

to

the

neutron

response

of

an

albedo

dosimeter.

`

For

a

more

complete

understanding

of

the

phenomenon

described

above,

refer

to

the

following

papers:

“A

Modified

Sphere

Neutron

Detector,”

D.E.

Hankins,

LA-3595.

“The

Substitution

of

a

BF,

Tube

for

the

Lil

Crystal

in

Neutron

rem

Meters."

D.E.

Hankins:

Health

Physics

Journal;

Volume

14,

Number

5,

May

1968.

B.

SPECIFICATIONS

Detector:

BF,

tube

is

not

supplied

with

this

sphere.

Use

the

same

tube

as

in

nine-inch

sphere.

Electronics:

Suitable

for

use

with

many

Eberline

counters

and

scalers.

Length:

Approximately

6%

inches

(15.9

cm).

Weight:

2

pounds

(0.91

kg)

less

detector

tube.

Calibration

with

Monoenergetic

Neutrons

by

National

Bureau

of

Standards

Energy,

keV

Typical

Response

of

Instrumnet

(cpm

per

mrem/h)

NRD

HP-280

2

215

1835

24

240

1320

144

80

200

235

70

160

515

35

35

754

35

25

1054

35

15

C.

AVAILABLE

ACCESSORIES

Detector:

BF,

Tube

Cable:

CA-15-36

17

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