Domain: Engineering — Nuclear Engineering
Target concept: Pointer deflection of a Geiger counter near a weak radiation source

Video generation prompt: A small sealed radioactive calibration source is placed on the experimental table. A gloved hand gradually moves a analog Geiger counter with a visible pointer away from the source, observing the counter's pointer.

Evaluation guide:
(i) Target concept: Inverse-square dependence of ionizing radiation intensity on distance from a point-like sealed source, as manifested in real-time analog meter response.
Minimum mechanism: Source must be sufficiently small and isotropic; counter must be analog with damped mechanical meter movement; no shielding or scattering objects between source and detector; pointer inertia must allow observable gradual decay of deflection.
(ii)Storyline: [Frame 0–2] Source stationary on table; counter held adjacent to source; pointer fully deflected. [Frame 3–6] Gloved hand initiates smooth rearward translation of counter; pointer begins immediate, continuous downward movement. [Frame 7–10] Counter reaches visibly increased separation; pointer settles at significantly reduced deflection angle. Throughout: fixed frontal camera angle; full visibility of source, counter front face (including dial and pointer), and gloved hand; no occlusions; lighting uniform and diffuse; table surface planar and static.

Manual:
Experimental Procedure
1. Place small sealed radioactive calibration source centered on clean lab table.
2. With gloved hand, hold analog Geiger counter (with visible mechanical pointer) close to source.
3. Gradually move counter straight away from source while observing pointer.
Observation of Experimental Phenomena
The pointer deflects less (moves toward zero) as the counter moves farther from the source — deflection magnitude decreases continuously and monotonically.
Summary of Experimental Principles
Geiger counter output is proportional to radiation flux, which follows inverse-square law with distance; reduced flux at greater distance causes smaller ionization events, resulting in lower pulse rate and thus smaller average pointer deflection on analog meter.

Prompt Grounding rubric:
level_1: No sealed radioactive calibration source is visible, no analog Geiger counter with a visible mechanical pointer is present, no gloved hand is in frame, and no directional motion of the counter relative to the source has taken place; none of the posted_prompt's core elements are present.
level_2: At least one core element is present in a recognizable but flawed form (e.g., a sealed source that is not clearly small or sealed, a Geiger counter shown without a visible mechanical pointer, or a gloved hand that never touches or moves the counter), but the source, counter, and hand do not co-occur in the correct spatial relationship, and the counter is never shown moving away from the source.
level_3: All three core objects are present and correctly typed: (a) a small sealed radioactive calibration source resting on the table, (b) an analog Geiger counter with a clearly visible mechanical pointer (not a digital display), and (c) a gloved hand (latex- or nitrile-style, not bare or robotic) gripping the counter and orienting it toward the source; no motion away from the source has occurred yet, but the starting arrangement matches the prompt.
level_4: Everything required for a 3 holds, and in addition, by the end of the clip the gloved hand has moved the counter to a position visibly farther from the source than the starting separation established in the 3-point arrangement (i.e., a net directional displacement away from the source has taken place) while the source itself stays resting on the table and the counter's dial and pointer remain oriented toward the camera.
level_5: Everything required for a 4 holds, and in addition, the source, the counter's full dial face (including the pointer), and the gloved hand are all simultaneously and correctly identifiable at every point in the clip: no digital readout is ever substituted for the mechanical pointer, no bare hand is ever substituted for the gloved hand, and no second source or duplicate counter ever appears in the scene.

Scientific and Causal Correctness rubric:
level_1: The pointer stays completely still at a fixed position regardless of the counter's distance from the source, or it moves in a way unrelated to that distance, or the pointer is absent, obscured, or replaced by a digital readout, showing no causal link between the counter-source separation and the pointer's behavior.
level_2: The pointer moves, but in the wrong direction for the inverse-square falloff (e.g., it swings toward higher deflection as the counter is moved farther away), or its motion is discontinuous (jumping, freezing, or resetting), or its deflection happens before the hand starts moving the counter or after it has already stopped.
level_3: The pointer is visibly linked to the counter casing and swings toward lower deflection (toward the zero end of the scale) as the counter moves farther from the source: the deflection magnitude decreases over time, and this decrease occurs while the counter is actually being moved, not before or after.
level_4: Everything required for a 3 holds, and in addition, the pointer's decrease in deflection is continuous, with no stalls or reversals, moves only in the direction of less deflection, and is visually proportional to the counter's growing distance from the source: larger deflection near the start of the move, smaller deflection near the end, with no frame showing the pointer creeping back up while the counter keeps receding.
level_5: Everything required for a 4 holds, and in addition, the pointer begins its decrease as soon as the hand starts moving the counter (no delay), stops decreasing once the counter stops moving (no lingering drift), and keeps a consistent orientation with no unexplained tilt or wobble; by the final frame the pointer tip sits visibly closer to the zero mark than it did in any earlier frame, confirming the deflection tracked the increasing source-counter distance throughout.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal breaks: the source jumps to a new spot or vanishes outright, the counter disappears and reappears elsewhere, the gloved hand detaches from the counter and reattaches at a different point, the overhead lighting flickers or its direction changes abruptly, the tabletop or background warps, or the shot cuts between multiple inconsistent camera angles.
level_2: Moderate breaks: the counter or source changes size or tilts discontinuously between frames, the hand's motion contains visible jumps or stutters (holding the same pose across two or more consecutive frames mid-move), the shadow cast by the counter or source shifts direction or intensity with no matching change in the light, or the tabletop shows a visible seam, cut, or mismatched perspective.
level_3: The camera viewpoint stays fixed for the whole clip; the gloved hand keeps continuous contact with the counter as it moves; the counter's separation from the source grows progressively, frame by frame, with no jump, reversal, or teleport; the source stays put on the table since only the counter is ever moved; and the overhead lighting keeps the same direction and brightness from first frame to last, so neither object's shadow shifts or disappears mid-motion.
level_4: Everything required for a 3 holds, and in addition, the motion reads as physically plausible: the hand-counter system moves as a single rigid unit with no sliding, slipping, or floating of the counter above the table, no distortion of the glove's texture or the counter's casing while it moves, and no interpenetration between the hand and counter or between the counter and the tabletop.
level_5: Everything required for a 4 holds, and in addition, every frame preserves this continuity cleanly: no motion blur obscures the dial or pointer, no strobing or flicker appears on the moving hand-counter assembly, no missing-frame jerkiness interrupts the translation, and the stationary source in the foreground shows no parallax mismatch against the counter as the hand carries it farther away.