1.1本试验方法包括通过快中子的热化或减速来测定土壤和岩石的含水量，其中中子源和热中子探测器均保持在表面。 1.2通过将热化中子或慢中子的探测率与先前建立的校准数据进行比较，确定受试材料每单位体积的质量含水量。 1.3以国际单位制表示的数值应视为标准。英寸-磅当量可能是近似值。 1.3.1工程专业的常见做法是同时使用磅来表示质量单位（lbm）和力（lbf）。 这隐含地结合了两个单位系统，即绝对系统和引力系统。本标准采用国际单位制的含水量绝对系统（千克/立方米）。单位重量（lbf/ft）的重力系统换算 可通过乘以0.06243或以kN/m为单位乘以9.807得出。以磅力/立方英尺表示的含水量记录不应被视为不符合本标准，尽管其使用在科学上是不正确的。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This test method covers the determination of water content of soil and rock by the thermalization or slowing of fast neutrons where the neutron source and the thermal neutron detector both remain at the surface. 1.2 The water content in mass per unit volume of the material under test is determined by comparing the detection rate of thermalized or slow neutrons with previously established calibration data. 1.3 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents may be approximate. 1.3.1 It is common practice in the engineering profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This implicitly combines two systems of units, that is, the absolute system and the gravitational system. This standard has been written using the absolute system for water content (kilograms per cubic metre) in SI units. Conversion to the gravitational system of unit weight in lbf/ft may be made by multiplying by 0.06243 or in kN/m by multiplying by 9.807. The recording of water content in pound-force per cubic foot should not be regarded as non-conformance with this standard although the use is scientifically incorrect. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.