- Radiation detector used to check levels of potentially harmful ionizing particles and rays in the environment and in objects such as particle accelerators, x-ray shielding, and industrial gauges.
- Detects ionizing radiation types such as alpha and beta particles, and gamma rays and x-rays.
- Dual-scale analog meter with needle-point display of counts per minute (CPM) and milliRoentgen (mR) per hour.
- Three selectable operation ranges of X1, X10, and X100 for adjustment when peak mR levels are met.
- Red, flashing counter and a beeping noise indicate each ionizing radiation increase event.
The Radiation Alert Monitor 4 is a hand-held radiation detector
with an analog display over three selectable operational ranges
for detecting potentially harmful ionizing alpha and beta
particles, and gamma and x-ray radiation. This meter has a
dual-scale, analog, needle-point display of counts per minute
(CPM), and milliRoentgen (mR) per hour. It detects the four main
types of ionizing radiation: alpha and beta particles, and gamma
rays and x-rays. It has three selectable operational ranges (X1,
X10, or X100) to be adjusted when the meter face peaks at the
highest mR level.
The Monitor 4 has a red, flashing counter and a beeping noise to
indicate each ionizing radiation event. It has a halogen-quenched
Geiger Mueller (GM) tube with a thin, mica end window for sensing
ionizing radiation. It is used to check radiation levels in the
environment and objects, such as particle accelerators, x-ray
shielding, and industrial gauges. An audio indicator with an
internally ed beeper can be turned off for silent operation.
The Monitor 4 cannot be returned.
Specifications
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Reading Ranges 0 to 0.5, 0 to 5, or 0 to 50 milliRoentgen (mR)
per hour, or 0 to 500, 0 to 5,000, or 0 to 50,000 cycles per
minute (CPM). Accuracy Factory-calibrated by pulse generator,
with accuracy + or -15% of reading full-scale, relative to Cesium
137. Energy Sensitivity 1,000 CPM/mR/hr (Cs137). Detection Alpha
down to 2.5 mega (million) electron volts (MeV), with typical
detection efficiency at 3.6 MeV at greater than 80%.
Beta at 50 kilo (thousand) electron volts (keV) with typical 35%
detection efficiency.
Beta at 150 kilo (thousand) electron volts (keV) with typical 75%
detection efficiency.
Gamma and x-rays down to 10 keV typical. Temperature Range -20
degrees to 55 degrees C (-4 degrees to 131 degrees F) and an
internal detector. GM Detector Halogen-quenched with window
thickness of 1.5 to 2.0 mg/cm2. The effective diameter is 0.92
cm/0.36”. Dimensions Dimensions are 209 mm x 71 mm x 50 mm (8.2”
x 2.8” x 1.9”). Weight 178 g (6.3 oz). Output 3.5 mm headphone
jack for use with observer software (not included) and
Windows-based computers. Normal Background Radiation
Approximately 5 to 20 CPM. Battery 9-V alkaline battery (not
included) for approximately 2,000 hours of continuous use in a
normal background. Radiation detectors can detect a broad range
of ionizing alpha and beta particles, and gamma and x-rays that
may be emitting harmful levels of radiation. They sense ionizing
radiation with an enclosed Geiger Mueller (GM) tube to count
radiation particles or rays. Alpha and beta particles are
measured in counts per minute (CPM) or counts per second (CPS).
Gamma rays and x-rays are measured in milliRoentgens (mR) per
hour, microSieverts (μSv) per hour, or milliSieverts (mSv) per
hour. Alpha particles are positively charged and heavier than
beta particles, and have a limited range of approximately 3 to 5
centimeters by air. Alpha particles can be shielded by objects
such as paper and unopened skin. High-energy beta particles are
electrons, heavier than gamma rays, and can take either a
positive or negative charge. Beta particles can be shielded by
aluminum or wood. High-frequency (short wavelength) gamma rays
are the strongest and lightest rays. Gamma rays are more
penetrating than alpha and beta particles. They can be shielded
by dense materials such as lead, and large masses of concrete,
hardened steel, or water. X-rays are man-made gamma rays, and
have essentially the same properties and function. Radiation
detectors commonly have either an analog or a digital display.
Analog radiation detectors output with a needle-point scale, and
digital units generate a numerical LCD digit display. Radiation
detectors are commonly used by hobbyists for safety detection and
rock inspection, and professionals in the in the nuclear,
medical, mining, instructional, and research industries.
SE International manufactures radiation detection products and
accessories under the Radiation Alert brand. The company was
founded in 1979 and is headquartered in Summertown, TN.
What’s in the Box?
* Monitor 4 radiation detector
* Carrying case with belt clip
* Instruction manual
* Conformite Europeene (CE) certification