Modules / TG-51 / TG-39 Cross-Cal

TG-51 / TG-39 Cross-Cal

Parallel-plate chamber cross-calibration against a calibrated cylindrical Farmer in a high-energy electron beam. Returns the effective N_Dw for the PP chamber.

TG-51 / TG-39 parallel-plate cross-calibration. Both chambers are read in the same high-energy electron beam (R₅₀ ≥ 5 cm preferred). The calibrated cylindrical Farmer fixes D_w at d_ref; the parallel-plate chamber's effective N_D,w is back-computed from its simultaneous reading.

Identity & beam

Machine name

Physicist

Beam energy label

Nominal energy (MeV)

Measurement date

R₅₀ (cm)

Cylindrical (reference) chamber

Chamber model

Chamber serial

N_D,w (Gy/C)

Chamber cal date

Parallel-plate chamber (being calibrated)

PP chamber model

PP chamber serial

Electrometer (shared, per ADCL cert)

Electrometer model

Electrometer serial

P_elec

Electrometer cal date

Environment & voltages (shared)

Temperature (°C)

Pressure (kPa)

Humidity (%) optional

V operating

V high

V low

Operating polarity

MU delivered cancels out

Cylindrical readings (nC)

Enter M+ and M− as signed raw readings. The d_ref + shift reading drives the cylindrical chamber's gradient correction (P_gr,Q).

M raw at d_ref

M raw at d_ref+0.5r_cav gradient

M+ (positive polarity)

M− (negative polarity)

M high (at V high)

M low (at V low)

Parallel-plate readings (nC)

PP chambers have no gradient correction (flat front face), so no shifted reading is needed.

M raw at d_ref

M+ (positive polarity)

M− (negative polarity)

M high (at V high)

M low (at V low)

Notes (optional)

Cancel

Parallel-plate k_R50,ecal data ships UNVALIDATED. Verify the resulting N_D,w,pp against your trusted method before clinical use. There is no PDF for this calc yet — results display on the results page. Calc engine reused verbatim from the native Radiant QuikQA app.