JZZ-1 Compensated Neutron Probe | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

Improve the sensitivity of the detector to ensure accurate and stable measurement results.
The weak source design adopted reduces the radiation dose to the user.
The two-stage source tank is used to further facilitate operation and enhance protection.

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Description

FAQ

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Description

Abstract

JZZ-1 Compensated Neutron Probe is a well logging probe developed based on nuclear logging methods. It uses isotope plutonium as a neutron source (optional controllable source). The fast neutrons generated by the neutron source are decelerated by the formation and become thermal neutrons. Part of the thermal neutrons will be captured by the nuclei in the formation due to further deceleration. The part not captured by the formation nuclei is detected by diffusion to the detector. The measured neutron porosity count rate can directly reflect the porosity of the formation.

Applicable Conditions

● Cased

● Bare hole fill with water or mud

Applications

● Exploration and quality evaluation of gas, liquid and other mineral deposits

● Identify lithology and calculate porosity and permeability

● Delineate and evaluate aquifers

Features

● Improve the sensitivity of the detector to ensure accurate and stable measurement results.

● The weak source design adopted reduces the radiation dose to the user.

● The two-stage source tank is used to further facilitate operation and enhance protection.

Specifications

Neutron source	Plutonium-beryllium source 5MeV, Intensity≥3.7x10Bq (controllable source neutron tube optional)
Detector	3He tube, Φ25.4x240mm
Counting range	1~60000cps
Neutron porosity measurement range	1%~60%
Signal output	Bipolar encoding

FAQ

In gravity exploration (SI), what is the unit of gravity? How to convert gravity units between SI and CGS?

What are gravitational field and gravitational potential?

What is the normal gravity field of the earth? What are the rules for the change of the normal gravity field with latitude and altitude?

① The normal gravity field of the earth: Assuming that the earth is a rotating ellipsoid (reference plane), the surface is glossy, the internal density is uniform, or it is distributed in concentric layers, the density of each layer is uniform, and the deviation of the shape of the ellipsoid from the geoid is very small, then the gravity field generated by the earth is the normal gravity field.
② The normal gravity value is only related to the latitude, the smallest at the equator and the largest at the poles, with a difference of about 50,000 g.u.; the rate of change of the normal gravity value with latitude is the largest at 45° latitude, and zero at the equator and the poles; the normal gravity value decreases with increasing altitude, and its rate of change is -3.086 g.u.. The main feature of the long-term change is the "westward drift" of the geomagnetic elements, both the dipole field and the non-dipole field drift westward, and have a global nature.

What is the relationship between gravitational field strength and gravitational acceleration?

What is gravity exploration?